KR101595154B1 - Wireless communication system, management device and base station management method - Google Patents

Abstract

The present invention provides a wireless communication system according to the present invention in which the management apparatus 3 is configured to store a base station ID including area information indicating an area in which the base station 2 is installed and a wireless parameter A wireless parameter assignment unit 33 for assigning wireless parameters according to the distance between the base station based on the area information and a network communication unit 31 for transmitting the assigned wireless parameters to the base station 2 The base station 2 also includes a network communication unit 21 for receiving radio parameters transmitted from the management apparatus 3 and a radio parameter setting unit 22 for setting radio parameters.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless communication system, a management apparatus, and a base station management method.

An embodiment of the present invention relates to a wireless communication system, a management apparatus, and a base station management method for centrally managing a plurality of base stations.

The present application is based on Japanese Patent Application No. 2012-172770 (filed on August 3, 2012), and enjoys a priority benefit from this application. This application is incorporated by reference in its entirety for all purposes.

Conventionally, in a wireless communication system, a design of a station (station) plays an important role in a cover area and interference suppression. However, in the adaptation design, the transmission power value and the radio frequency of the base station are required to be determined after considering the power value transmitted from the base station around the installation place manually beforehand, which is a great trouble for the installer.

It is also conceivable to receive a report on the received power value or interference information from a terminal that has received a radio wave from a newly installed base station, and to use this information to determine a radio frequency or a transmission power value. However, in this method, it is assumed that the base station is already transmitting certain radio waves, and the influence on other base stations is not considered in the transmitted radio waves, which may adversely affect existing services.

Further, Japanese Patent Application Laid-Open No. 2001-169338 discloses a technique in which a base station measures a received electric field strength for each frequency while switching a radio frequency, detects the presence or absence of an interference wave in a received radio wave of each radio frequency, Has been proposed.

However, in this method, in the case of the FDD (Frequency Division Duplex) system, since the frequency band transmitted by the base station differs from the frequency band transmitted by the terminal, a newly received radio frequency band must be mounted on the base station. Therefore, it is not effective for a base station that does not have such a function.

Japanese Patent Application Laid-Open No. 2001-169338

A problem to be solved by the present invention is to provide a wireless communication system, a management apparatus, and a base station management method capable of reducing labor and cost in installing a base station.

A wireless communication system according to the present embodiment is a wireless communication system including a plurality of base stations installed in a management area having a plurality of areas and a management device for managing the base stations, A radio parameter assignment unit for assigning radio parameters according to a distance between a base station based on the area information and a radio parameter list for storing identification information of the base station including the information and radio parameters of the base station; And a base station apparatus includes a second communication section for receiving a radio parameter transmitted from the management apparatus, and a radio parameter setting section for setting a radio parameter.

According to the wireless communication system having the above-described configuration, it is possible to reduce labor and cost in the base station installation.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a configuration example of a wireless communication system according to the present embodiment; Fig.
Fig. 2 is a block diagram showing the functional configuration of each device of the wireless communication system of Fig. 1; Fig.
3 is a diagram showing an example of a wireless parameter list;
4 is a diagram showing a problem in installing a base station;
5 is a diagram showing an example of mapping a base station ID and a position where a base station is installed in the first embodiment;
6 is a diagram showing an example other than mapping a base station ID and a location where a base station is installed;
7 is a sequence diagram showing a process of updating a wireless parameter list according to the first embodiment;
8 is a diagram showing an example of a wireless parameter list before a base station is newly installed;
9 is a diagram showing an example of a wireless parameter list immediately after a new base station is established;
10 is a flowchart showing a determination sequence of a radio frequency band;
11 is a diagram showing an example of a wireless parameter list after radio parameter adjustment;
12 is a diagram showing a cover area of each base station after radio parameter adjustment;
13 is a diagram showing an example of mapping a base station ID and a position where a base station is installed in the second embodiment;
14 is a diagram showing an example of a wireless parameter list in the second embodiment;
Fig. 15 is a diagram showing an example of mapping the base station ID and the location of the base station in the third embodiment; Fig.

Hereinafter, a wireless 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 (collectively referred to as terminal 1), base stations 2-1 to 2-n (collectively referred to as base station 2) (3), a maintenance network, and a communication network. The base station 2 performs wireless communication with the terminal 1 existing in the cover area. The management apparatus 3 is connected to a plurality of base stations 2 by wire or wireless lines. Further, the management apparatus 3 is connected to a maintenance network and a communication network, and is connected to the management server 4 via a maintenance network. The maintenance network and the communication network may be any type of network such as an IP network or an ISDN network as long as they can arbitrarily communicate with each other. In this system, it is possible to locally optimize the setting information of the base station 2 by centrally managing the base station 2 to be distributed (deployed) by the management apparatus 3.

2 is a block diagram showing the functional configuration of each device in the wireless communication system of Fig. The base station 2 has a network communication unit 21, a wireless parameter setting unit 22 and a radio unit 23. The management apparatus 3 has a network communication unit 31, a wireless parameter list 32, and a wireless parameter assigning unit 33. [ It should be noted that the functions of the base station are assumed to have well-known functions. The network communication unit 21 is connected to the network communication unit 31 of the management apparatus 3.

The management apparatus 3 has a wireless parameter list 32 for storing wireless parameters for each base station 2 under the subnet connected thereto. The radio parameter list 32 includes radio parameters (for example, radio frequency band and transmission power value) of radio waves transmitted by each base station in this list, as will be described later. In the drawings, the radio frequency band is simply referred to as a radio frequency. The radio parameter assignment unit 33 determines the radio frequency band and the transmission power value of the radio waves transmitted by the respective base stations with reference to the radio parameters included in the radio parameter list 32, Notifies the base station 2 of the radio frequency band and the transmission power value through the base station 2, and then updates the radio parameter list 32 with the determined radio parameters.

The base station 2 receives a radio parameter including a radio frequency band and a transmission power value notified from the management device 3 via the network communication unit 21 and transmits the received radio parameter to the radio parameter setting unit 22 (2), and transmission of radio waves (radio signals) is started.

Fig. 3 is an example of the wireless parameter list 32. Fig. As shown in Fig. 3, the wireless parameter list 32 stores the wireless parameters including the base station ID and the radio frequency band and the transmission power value. In the wireless parameter list 32, the base station ID and the wireless parameter are associated. In addition, the type of the wireless parameter maintained as a list can be arbitrarily changed depending on the system.

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

(Example 1)

First, with reference to Fig. 4, a problem at the time of establishing a base station will be described. In FIG. 4, three base stations A, B and C are already installed in the management area of the management apparatus 3, and one base station D is newly installed. In this system, three radio frequency bands [alpha], [beta], and [gamma] can be used. Base station A uses radio frequency band alpha, base station B uses radio frequency band beta, and base station C uses radio frequency band gamma.

When there is a radio frequency band that is not being used, interference does not occur when the base station D uses a radio frequency band that is not simply used, so that the base station D can operate without affecting existing services. However, in the case of Fig. 4, since there is no unused radio frequency band, it is necessary to calculate the radio frequency band and the transmission power value that do not affect other base stations. In general, this work is done by human hands, and the labor force for this work has become a problem.

5 shows an example of mapping the base station ID and the location of the base station in this system.

5, a building managed by the management apparatus 3 is divided into three sections in the north-south direction and five sections in the east-west direction so as to form a plurality of areas in total. A unique area ID indicating the location of the area is assigned to each area. In this example, the first two characters of the base station ID indicate area information indicating an area in which this base station is installed. The first character from the beginning indicates the position in the east-west direction, and the second character from the beginning indicates the position in the north-south direction. For example, the base station A belongs to the most northernmost end area (area "A1") of the area managed by the management apparatus 3. Therefore, the base station ID includes area information indicating an area where the base station is installed in the management area. The management apparatus 3 manages the correspondence between the base station ID and the area.

The following four-digit IDs other than the above may be arbitrary characters, may be used as necessary information depending on the system, and the number of digits may be changed.

For example, since the base station A belongs to the area " A1 ", the base station ID starts from A1, and since the base station A is the first base station of the area, 0001 is given after the base station ID. Therefore, the base station ID of the base station A becomes " A10001 ". The ID is manually set to the base station by the installer when the base station is installed.

In this embodiment, the base station ID is used as identification information of the base station including area information indicating an area where the base station is installed.

Further, the management apparatus 3 calculates the weight (first weight) of the distances of the adjacent areas based on the size of the building and the number of divided areas. For example, if the size of the building shown in Fig. 5 is 30 m in the north-south direction and 50 m in the east-west direction, and the building is divided into 3 parts in the north-south direction and 5 parts in the east-west direction, . In this case, the weights of the distances of adjacent areas are east-west: north-south = 1: 1. That is, the movement of one area in the north-south direction and the movement of one area in the east-west direction indicate the same attenuation of the received power.

In contrast, in Fig. 6, a building having the same size as Fig. 5 is divided into three in the north-south direction and three in the east-west direction. The weights of the distances of adjacent areas are east-west: north-south = 1.66: 1. That is, the movement of one area in the north-south direction gives the attenuation of the received power by the weight 1, whereas the movement of one area in the east-west direction gives the attenuation of the received power of the weight 1.66.

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

The base station ID is an ID determined uniquely in the system and is a kind of parameter obtainable from the base station by using a protocol for managing a network such as Simple Network Management Protocol (SNMP) It is not necessary to mount the new structure in the base station 2.

From the above structure, the management apparatus 3 can identify the approximate location where the base station is installed by referring to the base station ID. The management apparatus 3 acquires the base station ID after activation of the base station 2 and adds the acquired base station ID to the radio parameter list 32 and transmits the radio frequency band and the transmission power value .

7 is a sequence diagram showing a process of updating the wireless parameter list. The management apparatus 3 receives the installation completion notification (base station ID = A10001) of the base station A and adds the base station ID (A10001) to the wireless parameter list 32 and transmits the radio frequency band and the transmission The power value is reviewed. The base station A receives the notification of the radio parameters (radio frequency band?, Transmission power value 40) from the management apparatus 3 and sets the radio frequency band? And the transmission power value 40 in the radio section 23 to start operation.

Similarly, the management apparatus 3 receives the installation completion notification (base station ID = B30001) of the base station B, adds the base station ID (B30001) to the wireless parameter list 32, And the transmission power value. The base station B receives the notification of the radio parameters (radio frequency band?, Transmission power value 40) from the management apparatus 3, sets the radio frequency band? And the transmission power value 40 in the radio section 23, and starts operation. The management apparatus 3 receives the installation completion notification (base station ID = D20001) of the base station C and adds the base station ID (D20001) to the wireless parameter list 32, And the transmission power value. The base station C receives the notification of the radio parameters (radio frequency band?, Transmission power value 50) from the management apparatus 3, sets the radio frequency band?, The transmission power value 50 in the radio section 23, and starts operation.

In this operating state, the base station D is newly established, and the management apparatus 3 receives the installation completion notification (base station ID = E30001) of the base station D. The management apparatus 3 adds the base station ID (E30001) to the wireless parameter list 32 and re-examines the radio frequency band and the transmission power value by the wireless parameter assignment unit 33 as follows.

Fig. 8 is a wireless parameter list 32 maintained by the management apparatus 3 before the base station D in Fig. 4 is newly established. The area division is 5 x 3 shown in Fig. At this stage, there are three base stations, and each of the three base stations uses different radio frequency bands. As a result, at this stage, the service can be provided without any problem without interfering with each other.

Fig. 9 shows a wireless parameter list 32 immediately after the base station D is newly established. From this wireless parameter list 32, the management apparatus 3 can know that the new base station D is located in the area of E3.

A method of determining the radio frequency band and the transmission power value of the newly installed base station D will be described below. First, the radio frequency band is determined.

10 is a flowchart showing a method of determining a radio frequency band when the base station D is newly located.

When there is a radio frequency band that is not set in any of the base stations in the target radio frequency band among the available radio frequency bands (step S1: YES), the radio parameter assigning unit 33 assigns the radio frequency band (Step S2). That is, when there is a radio frequency band that is not allocated to the base station (step S1: YES), the radio frequency band is arbitrarily selected among the radio frequency bands not allocated (step S2). As the selection method, the radio frequency band may be determined in a predetermined order, or the radio frequency band may be determined at random.

On the other hand, if all of the available radio frequency bands are allocated to at least one of the base stations in the area and there is no unassigned radio frequency band (step S1: No), the radio frequency band allocated to the next base station is somewhere The same radio frequency band as that of the radio base station with respect to the base station of the base station is generated. In order to suppress this interference problem, the wireless parameter assignment unit 33 searches the radio frequency band from the base station closest to the location where the base station is installed, and selects the radio frequency band that is found last (step S3). The area information included in the base station ID is used when measuring the distance of the distance and the weight of the distance between the areas held by the management apparatus 3 is used.

For example, a case of determining the radio frequency band of the base station D in Fig. 5 will be considered. As a premise, it is assumed that the radio frequency bands?,?, And? Can be used in this system.

When the base station D is installed and the radio frequency band is determined, the radio frequency bands [alpha], [beta], and [gamma] have already been used by other base stations. Therefore, the radio frequency band of " E30001 " must be selected from?,?, And?. Next, the distance to the other base station is calculated from " E30001 " and the examination of the radio frequency band is started from the nearest base station. In this example, the respective distances to the base station A, the base station B, and the base station C are as follows.

From the above results, the nearest base station is the base station C, and the radio frequency band used by the base station is?. When the same radio frequency band as the radio frequency band of the nearest base station is used, the radio frequency band gamma is excluded from the selection because the influence of the radio wave interference increases. The next nearest base station is the base station B, and the radio frequency band used by the base station is β. In the same manner as described above, the radio frequency band? Is also excluded from the selection. Among the available radio frequency bands at this point, the remaining radio frequency bands, that is, the last found radio frequency band, are selected as a radio frequency band of the base station D, because?

In the first embodiment, the order of determination of the radio frequency band in Fig. 10 is used, but important factors are different depending on the system. The above is merely an example, and the logic for determining the radio frequency band is arbitrary.

Then, in consideration of interference with the base station A using the same radio frequency band, a transmission power value that does not interfere with each other is determined. The weight of the distance between the areas maintained by the management apparatus 3 is also used to determine the transmission power value. Fig. 11 shows a radio parameter list after the radio frequency band and the transmission power value are determined. In the case of Fig. 11, the transmission power value of the base station A is decreased. In addition, since there is a possibility that a dead zone occurs with the decrease of the transmission power value of the base station A, the coverage area is ensured by increasing the transmission power of the radio frequency band? And the radio frequency band?.

That is, as described above, the radio parameter assignment unit 33 assigns the radio frequency band and the transmission power value, which are radio parameters, to the base station in accordance with the distance between the base stations based on the base station ID (identification information) of the radio parameter list.

As shown in Fig. 7, the management apparatus 3 notifies each base station of the determined radio parameters. As a result, the base station A receives the notification of the radio parameters (radio frequency band?, Transmission power value 30) from the management apparatus 3 and sets the radio frequency band? And the transmission power value 30 in the radio section and starts operation. The base station B receives the notification of the radio parameters (radio frequency [beta], transmission power value 50) from the management apparatus 3 and sets the radio frequency band [beta] and the transmission power value 50 in the radio section and starts operation. The base station C receives the notification of the radio parameters (radio frequency band?, Transmission power value 60) from the management apparatus 3 and sets the radio frequency? And the transmission power value 60 in the radio section and starts operation. The base station D receives the notification of the radio parameters (the radio frequency band alpha, the transmission power value 30) from the management apparatus 3 and sets the radio frequency band alpha and the transmission power value 30 in the radio section and starts operation.

Fig. 12 shows the state of the cover area of each base station after the radio parameter adjustment. By installing the management apparatus 3 in this manner, it is possible to automatically determine the radio frequency band and the transmission power value in cooperation with other base stations, thereby reducing the labor and cost that have been manually handled.

Therefore, according to the wireless communication system, the management apparatus, and the base station management method according to the present embodiment, it is possible to reduce labor and cost in the base station installation.

In the first embodiment, a description has been given of the case where the base station D is newly constructed. However, when the already installed base station is moved, and the base station is removed due to a failure or the like, The wireless parameters can be adjusted. In the case of the base station movement, the base station ID is changed according to the installation location of the destination, and in the case of demolition, the base station ID is deleted, and then the radio frequency band and the transmission power value are reset.

(Example 2)

In the second embodiment, a case where the present embodiment is extended to a plurality of systems (three dimensions) will be described. 13 shows an example of mapping the base station ID and the location of the base station to a three-dimensional space. In the first embodiment, the case of the planar space is shown. However, in the second embodiment, it is effective for the three-dimensional space, especially the base station installed indoors. This is because, since it is installed indoors, it is difficult to acquire position information by GPS (Global Positioning System), and even if it can be acquired, 1F, 2F, 3F ... When the base station is installed at the same position as the base station, the position information can not be effectively utilized because it appears as if there are several base stations at the same location.

In Fig. 13, a two-story building is shown, and the first and second layers are of the same size and have the same shape. 13, the first three digits of the base station ID indicate the location, the first digits of the first digits are the information of the number of floors, the second digits are the information of the east-west direction, and the third digits are the directions of the north-south direction Information. For example, since the base station A is located in the area of "B3" on the first floor, the base station ID is set to "1B3001". The last three digits of the last three digits are arbitrary, but "001" is given since the first three digits are the first base station of the area.

The case where the weight of the distance between the areas is considered as only each layer is the same as that of Fig. 5, but Fig. 13 gives the weight of the distance between the first layer and the second layer. The weight of the distance over the layer is not simply represented by the distance but the weight of the distance (the second weight) is given according to the material supporting the layer. For example, in the case of timber which is easy to penetrate, the weight of the distance is made small, and in the case of thick concrete, the weight of the distance is made large. If the weight of the distance is increased, for example, it means that the first and second layers do not affect (interference) each other even if the base station is located at the same place. In the example of FIG. 13, the weight of the distance between the layers is 7. Fig. 14 shows a wireless parameter list indicating the radio frequency band and the transmission power value in this case. In this system, the radio frequency bands [alpha], [beta], and [gamma] can be used.

Next, consider a case where a base station E is newly installed in Fig. The weights of the distances between the base station E and the other base stations are calculated as follows based on the determination order of the radio frequency band described above.

From the above results, the nearest base station is the base station B, and the radio frequency band used by the base station is?. The next nearest base station is A, and the radio frequency band used by the base station is α. From this result, the last found radio frequency band is γ. Since it is known that the radio frequency band that is the least interfering is?, It determines? As the radio frequency band of the base station E. It can be seen from the radio parameter list of Fig. 14 that the base station other than the one using the radio frequency band? Is the base station C

It is assumed that the transmission power value can be guaranteed that interference does not occur when the weight of the distance is equal to or greater than 30 when the transmission power value is 40. [ Since the weight of the distance to the base station C, which is the only interference possibility, is 62, interference does not occur if the transmission power value is set to 40 or less. Actually, the transmission power is further narrowed in consideration of other cover areas and the like.

As described above, the radio parameter assigning unit 33 assigns the radio frequency band and the transmission power value, which are radio parameters, to the base station in accordance with the distance between the base stations based on the base station ID (identification information) of the radio parameter list.

Therefore, according to the wireless communication system, the management apparatus, and the base station management method according to the present embodiment, it is possible to reduce labor and cost in the base station installation.

(Example 3)

In the second embodiment, the distance between the base station of the first layer and the base station of the second layer is not the actual distance but the weight (second weight) of the distance in consideration of the transmittance of the radio wave. This is effective not only in three dimensions but also in two dimensions. For example, if there is a room surrounded by concrete with only one corner, the radio wave becomes difficult to reach the room. 5 and 6 show an embodiment in which there is no obstacle in the two-dimensional plane and a free space is assumed. However, by increasing the weight of the distance to the portion where the propagation is difficult to reach, .

15 shows an example of mapping the base station ID and the location of the base station in the third embodiment. Fig. 15 shows that the weight of the distance of the concrete is set to 4 instead of 1 when calculating the weight of the distance including the area of " E3 ". That is, the area of " E3 " shows that the radio wave is difficult to reach. By doing this, it becomes possible to set an appropriate radio parameter according to the actual propagation environment.

Therefore, according to the wireless communication system, the management apparatus, and the base station management method according to the present embodiment, it is possible to reduce labor and cost in the base station installation.

(Modified example)

In the above embodiment, the base station ID includes position information (area information) of the base station. However, the identification information of the base station other than the base station ID may include the location information, and the identification information of the base station including the location information may be appropriately changed according to the system. For example, the IP address set in the base station may include the location information of the base station, such as " 10.168.1 (layer) .1 (area) ". In this case, the IP address including the location information is stored in the wireless parameter list together with the base station ID. In this modification, the IP address is used as identification information of a base station including area information indicating an area where the base station is installed. The base station ID does not need to include location information.

As described above, according to the present embodiment and the modification, information that can be utilized as a location, such as a base station ID that needs to be set in the base station, is given to the management apparatus that centrally manages the base stations, The position information is grasped and the radio frequency band and the transmission power value can be automatically determined. Therefore, according to the wireless communication system, the management apparatus, and the base station management method of at least one embodiment or a modification, it is possible to reduce labor and cost in the base station installation.

Conventionally, it has been necessary to manually determine the radio frequency band and the transmission power value after considering the surrounding radio conditions at the time of installing the base station. However, in this embodiment and the modified example, consideration has been given to the radio wave conditions automatically transmitted from other base stations The transmission power value can be determined. As a result, the existing service is not adversely affected, and the installer's labor force can be greatly reduced. In addition, in the present embodiment and the modification, it is not necessary to newly mount the reception frequency band in the base station, and it is also effective for the base station in which such a function is not mounted.

In addition, although a few embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and alterations can be made without departing from the gist of the invention. These embodiments and their modifications fall within the scope and spirit of the invention and are included in the scope of the invention as defined in the claims and their equivalents.

Claims (11)

A wireless communication system comprising a plurality of base stations provided in a management area having a plurality of areas formed by division, and a management apparatus managing the base station,
The management apparatus includes:
A wireless parameter list storing identification information of the base station including area information indicating an area in which the base station is installed and wireless parameters of the base station;
A wireless parameter assignment unit for assigning the wireless parameter according to a distance between base stations to which a first weight is given based on the size of the management area and the number of divided areas and a second weight is given based on the transmittance of radio waves for each area, Wow,
And a first communication unit for transmitting the allocated radio parameter to the base station
And,
The base station comprises:
A second communication unit for receiving the radio parameter transmitted from the management apparatus;
And a wireless parameter setting unit
And a wireless communication system. delete The method according to claim 1,
Wherein the wireless parameter includes a radio frequency band and a transmission power value. The method according to claim 1,
Wherein the identification information of the base station is a base station ID including area information indicating an area in which the base station is installed. The method according to claim 1,
Wherein the identification information of the base station is an IP address including area information indicating an area in which the base station is installed. A management apparatus for managing a plurality of base stations provided in a management area having a plurality of areas formed by division,
A wireless parameter list storing identification information of the base station including area information indicating an area in which the base station is installed and wireless parameters of the base station,
A wireless parameter assignment unit for assigning the wireless parameter according to a distance between base stations to which a first weight is given based on the size of the management area and the number of divided areas and a second weight is given based on the transmittance of radio waves for each area, Wow,
And a communication unit for transmitting the allocated radio parameter to the base station
. delete The method according to claim 6,
Wherein the radio parameter includes a radio frequency band and a transmission power value. A base station management method used in a wireless communication system including a plurality of base stations provided in a management area having a plurality of areas formed by division and a management apparatus managing the base station,
The management apparatus includes:
A step of storing identification information of the base station including the area information indicating an area in which the base station is installed and a radio parameter of the base station in a radio parameter list for each base station;
Allocating the wireless parameter according to a distance between base stations to which a first weight is given based on the size of the management area and the number of divided areas and to which a second weight is given based on the transmittance of radio waves for each of the areas;
Transmitting the allocated radio parameter to the base station
Lt; / RTI >
The base station comprises:
Receiving a radio parameter transmitted from the management apparatus;
Setting the wireless parameter
Gt; delete 10. The method of claim 9,
Wherein the radio parameter comprises a radio frequency band and a transmission power value.

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