KR100668602B1 - Method and System for Providing Mobile Bill Service - Google Patents

Abstract

The present invention relates to a method and a system for providing a mobile billing service.

The present invention provides a method for providing a mobile bill service, the method comprising: (a) a mobile bill server transmitting a message including a bill guide message and a callback URL to a mobile communication terminal; (b) the mobile terminal receiving a password by executing a viewer program; (c) the mobile communication terminal accessing the mobile bill server using a URL included in the message to receive the mobile bill data and the subscriber identification number; And (d) if the password entered in step (b) and the subscriber authentication number received in step (c) match, outputting the mobile bill using the mobile bill data. It provides a method and system for providing a mobile billing service.

According to the present invention, the mobile bill is output by using a viewer program installed in the mobile communication terminal, so that various information related to the usage fee of the subscriber can be easily inquired.

Mobile Billing, Viewer Program, VM, Subscriber Authentication, Billing History Management Server, Execution Application Server

Description

Method and system for providing mobile billing service {Method and System for Providing Mobile Bill Service}

1 is a block diagram showing a system for providing a mobile billing service according to a preferred embodiment of the present invention;

2 is a flowchart showing a method for providing a mobile billing service according to a preferred embodiment of the present invention;

3 is a view showing an example screen of a process of inquiring a mobile bill;

4 is a diagram illustrating an example screen in which additional information of a mobile bill is inquired.

<Explanation of symbols for the main parts of the drawings>

100: mobile communication terminal 110: mobile communication network

120: mobile bill server 130: billing history management server

140: running application providing server 150: SMS server

The present invention relates to a method and a system for providing a mobile billing service. In more detail, when a message including a billing guidance message and a callback URL is received from a mobile communication terminal, a viewer program installed in the mobile communication terminal is executed to input a password for subscriber authentication, and the URL included in the message is used. A method of providing a mobile billing service which accesses a mobile billing server to receive mobile billing data and a subscriber verification number, and outputs a mobile bill using the mobile billing data in a viewer program if the password and the received subscriber verification number match; It's about the system.

As computers, electronics, and communication technologies have made rapid progress, various wireless communication services such as voice call service and text message service using a wireless communication network have been provided. In addition, a wireless Internet service that provides an Internet service based on Transmission Control Protocol / Internet Protocol (TCP / IP) to a mobile communication service subscriber through a wireless communication network is being activated. The wireless Internet service is an advanced personalization service according to the use of the terminal of the individual and has a feature of providing a unique information based on the mobility of the user.

On the other hand, the wireless communication service provider bills the usage fee according to the usage history of the subscribers, and conventionally sent a bill by mail to each subscriber. However, when invoices are mailed to a large number of subscribers one by one, mail is often lost during delivery or subscribers cannot check the invoices because they do not receive them. there was. Therefore, in order to solve this problem, it is possible to reduce the cost on the service provider side by sending the invoice through the e-mail, and to access the e-mail service on the subscriber side to conveniently view the invoice.

However, the conventional email bill has a problem in that it is not possible to provide a service for conveniently checking the bill anytime and anywhere because it is necessary to access and check the email service through a computer installed in a company or home based on the wired Internet. Therefore, in order to solve this problem, a service for accessing the wireless Internet from the mobile communication terminal to query the bill is provided.

The conventional bill inquiry service through the wireless Internet has a problem of providing only a piece of information based on text, unlike an email bill provided in a multimedia form, and the data capacity is large even when a multimedia form bill is provided to a mobile communication terminal. Therefore, there is a disadvantage that the transmission takes time and cost. In addition, a bill inquiry service with an interface for easily inquiring various information related to a subscriber's usage fee through a mobile communication terminal has not been presented yet.

In order to solve this problem, the present invention, when receiving a message including a billing guide message and callback URL from the mobile communication terminal, by running the viewer program installed in the mobile communication terminal receives a password for subscriber authentication, included in the message Receives mobile bill data and subscriber verification number by accessing the mobile bill server using the provided URL.If the entered password and subscriber verification number match, the viewer program outputs the mobile bill using the mobile bill data. An object of the present invention is to provide a mobile bill service providing method and system.

According to a first object of the present invention, a mobile billing service in a mobile communication system including a mobile communication network, a mobile billing server for providing mobile bill data, and an execution application providing server for providing a viewer program for inquiring a mobile bill. A method of providing a method comprising the steps of: (a) the mobile bill server transmitting a message including a bill guide message and a call-back Uniform Resource Locator (URL) to the mobile terminal; (b) the mobile terminal receiving the password by executing the viewer program; (c) the mobile communication terminal accessing the mobile bill server using the URL included in the message to receive the mobile bill data and the subscriber identification number; And (d) if the password inputted in step (b) and the subscriber authentication number received in step (c) match, outputting a mobile bill using the mobile bill data. It provides a method for providing a mobile billing service comprising a.

According to a second object of the present invention, a system for providing a mobile bill service for providing a mobile bill data to a mobile communication terminal for inquiry through a mobile communication network, wherein the billing message and a callback URL is sent to the mobile communication terminal. A mobile bill server for transmitting a message including the mobile bill data and providing the mobile bill data and the subscriber verification number to the mobile communication terminal; And executes the mobile communication terminal to input a password, accesses the mobile bill server using the URL included in the message, receives the mobile bill data and the subscriber authentication number, and the password and the subscriber. If the authentication number is matched to provide a system for providing a mobile billing service comprising a server running application providing server for providing a viewer program for outputting a mobile bill using the mobile bill data to the mobile communication terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a block diagram showing a system for providing a mobile bill according to a preferred embodiment of the present invention.

As shown in FIG. 1, a system for providing a mobile bill according to a preferred embodiment of the present invention includes a mobile communication terminal 100, a mobile communication network 110, a mobile bill server 120, and a billing history management server 130. , An execution application providing server 140, a short message service (SMS) server 150, and the like.

The mobile communication terminal 100 according to the preferred embodiment of the present invention can transmit and receive a wireless message as well as perform a telephone call through a mobile communication with the other party via the mobile communication network 110, and uses the provided information retrieval function. It is a terminal that can search the desired information by accessing the wireless Internet. In addition, the mobile communication terminal 100 downloads and installs a viewer program for outputting the mobile bill on the screen from the execution application providing server 140, and includes a virtual machine (VM) for executing the viewer program. have.

Such virtual machines include Shinjisoft's GVM (General VM) developed by the mobile C language, SK Telecom's SK-VM and Sun Microsystems using J2ME's Java 2 Micro Edition specification. Kilobyte VM (KVM), etc. may be used, and the Wireless Internet Platform for Interoperability (WIPI), which is a mobile standard platform standard created by the Korea Wireless Internet Standardization Forum, may be used.

When the mobile communication terminal 100 according to the preferred embodiment of the present invention receives a short message including a billing guidance message and a callback URL which is address information for accessing the mobile billing server 120 from the SMS server 150, Run the viewer program and enter the password for authentication. The mobile terminal 100 receiving the password accesses the mobile bill server 120 through the mobile communication network 110 using the callback URL to receive the mobile bill data and the subscriber verification number, and the password and the subscriber verification number. If is matched, you can search mobile bill through viewer program.

Here, the mobile communication terminal 100 stores the received mobile bill data in its storage space, such as a memory, and outputs the mobile bill using the mobile bill data through the viewer program as needed even after receiving the mobile bill data. Can be inquired. In addition, when the storage capacity of the mobile communication terminal 100 is insufficient, it is possible to delete old mobile bill data received and stored longest in the storage space and to store newly received mobile bill data.

In the present invention, the mobile bill data is a charge for the mobile communication subscriber by calculating the mobile communication service usage fee of the mobile communication subscriber in units of daily, monthly, yearly, etc., and terminal identification number (MIN: Mobile) of the mobile communication terminal 100. A text tag including an identification number, a name of a mobile subscriber, selected plan information, and various bill details is attached to a tag that can classify the item by text. For example, "<App. Title> January 2005 mobile bill <App. MIN> 011-333-3333 <App. Name> Hong Gil-dong ....." In front of the text, the <App. Title>, <App. MIN>, <App. By attaching tags such as Name>, the viewer program checks the tag to check the text items and outputs the corresponding text using the graphic.

That is, the viewer program according to the present invention performs an authentication procedure for confirming whether or not a legitimate mobile communication subscriber is used according to a predetermined algorithm, and upon successful authentication, reads the mobile bill data received from the mobile communication terminal 100 to read the mobile bill. According to a predetermined tag included in the data, the mobile bill details are output on the screen using a graphic. Accordingly, the mobile bill server 120 providing the mobile bill data and the execution application providing server 140 providing the viewer program interwork with each other so that the viewer program can read and output the mobile bill data. It is desirable to produce and provide.

The mobile communication terminal 100 according to the preferred embodiment of the present invention is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a hand-held PC, a global system for mobile (GSM). Various wireless communication terminals, such as a phone, a wideband CDMA (WCDMA) phone, a Code Division Multiple Access (CDMA) 2000 phone, and a Mobile Broadband System (MBS) phone, may be included. Here, MBS phone refers to a mobile communication terminal to be used in the fourth generation system that is currently discussed.

The mobile communication network 110 according to a preferred embodiment of the present invention serves to transmit and receive a radio signal including a voice signal and a data signal, and transmits a base station transmitter, a base station controller, a mobile communication switching center, a packet data serving node (PDSN), and the like. It can be configured to include.

The base station transmitter is a network endpoint device that performs wired / wireless conversion and wireless signal transmission and reception between the mobile communication terminal 100 and the base station controller and is directly connected to the mobile communication terminal 100. The base station controller controls the base station transmitter, and assigns and releases radio channels to the mobile communication terminal 100, controls transmission output of the mobile communication terminal 100 and the base station transmitter, soft handoff, and hard handoff. Determination of handoff, transcoding and vocoding, and operation and maintenance of wireless access network are performed.

The mobile telecommunication switching center is equipped with a plurality of electronic exchanges to perform basic and additional service processing, incoming and outgoing call processing of subscribers, location registration and handoff procedures, interworking with other networks. The PDSN manages sessions to perform wireless data as packet data, performs routing processing of packet data, and connects the mobile communication network 110 with the packet data network.

Mobile communication network 110 according to a preferred embodiment of the present invention is IS (Interim Standard) -95 network, GSM network, CDMA2000 1X network, CDMA2000 3X network, CDMA2000 EV-DO (Evolution-Data only) network, WCDMA network, WiBro (Wireless Broadband Internet) may include a wireless access network by a variety of mobile communication systems, such as.

The mobile bill server 120 according to a preferred embodiment of the present invention transmits a message including a bill guide message and a callback URL regarding the mobile bill notice to the mobile communication terminal 100. To this end, the mobile billing server 120 transmits the mobile billing guidance message and the callback URL to the SMS server 150 to send a short message including the above-described billing guidance message and the callback URL from the SMS server 150 to the mobile communication terminal 100. Can be controlled. Here, the billing guide message is "Hello, this is SK Telecom. To confirm the invoice for January 2005, a message to inform you that a mobile bill has been issued.

In addition, the mobile bill server 120 inquires mobile subscriber information and billing information data from the billing history management server 130 to generate mobile bill data and to obtain subscriber authentication information for authentication, in the SMS server 150 When the mobile communication terminal 100 receives the short message, the mobile terminal 100 transmits the mobile bill data and the subscriber authentication information to the mobile communication terminal 100.

Billing history management server 130 according to a preferred embodiment of the present invention classifies and stores mobile subscriber information and billing information data, using these data subscription, change, adjustment, termination, distribution network for mobile communication services It is a sales business system that performs functions such as management, calculation of statistical data, customer management such as repairing the mobile communication terminal 100, and billing management such as billing, storage, and non-payment. In addition, the billing history management server 130 receives the request of the mobile bill server 120 and provides mobile subscriber information and billing information data.

The execution application providing server 140 according to the preferred embodiment of the present invention generates and stores a viewer program for receiving mobile bill data from the mobile communication terminal 100 and inquiring the mobile bill. The execution application providing server 140 transmits a viewer program to the mobile communication terminal 100 through the mobile communication network 110 when the mobile communication terminal 100 requests to transmit the mobile bill.

More specifically, the mobile communication terminal 100 may transmit a viewer program transmission request or a viewer program update (confirmation) request to the execution application providing server 140. When the execution application providing server 140 is a simple transmission request from the mobile communication terminal 100 without the viewer program, it downloads the viewer program that meets the specifications of the terminal. The mobile communication terminal 100 in which the viewer program is already installed transmits a viewer program update (confirmation) request including the version information of the installed viewer program to the execution application providing server 140. The execution application providing server 140 checks the received viewer program version information and transmits an updated viewer program or a patch program to the mobile communication terminal 100 when an update is required, and when the update is not necessary, such contents are provided. The response signal is transmitted to the mobile communication terminal 100.

The SMS server 150 according to the preferred embodiment of the present invention generates a short message including a billing guide message and a callback URL received from the mobile bill server 120, and transmits the mobile communication terminal 100 through the mobile communication network 110. To send. Here, the mobile bill server 120 may request the transmission of the short message to the SMS server 150 at a point in time or a predetermined time period according to a preset message transmission schedule, and accordingly, the SMS server 150 may request the requested point in time. Alternatively, the short message is transmitted to the mobile communication terminal 100 at a predetermined time interval. For example, since a mobile communication fee is generally billed monthly, a message may be transmitted every month, such as a specific date every month, according to a preset message transmission schedule.

Of course, it is also possible to query the mobile bill at a desired time by requesting the mobile bill from the mobile communication terminal 100 side. To this end, when the mobile communication terminal 100 requests a short message by accessing a predetermined telephone number, the SMS server 150 may transmit the short message to the mobile communication terminal 100. For example, if a specific telephone number is designated as "** 379" and the mobile communication terminal 100 is connected to the above-mentioned number, the SMS server 150 transmits a short message.

Meanwhile, the means for transmitting the message including the billing guidance message and the callback URL to the mobile communication terminal 100 is not limited to the above-described SMS server 150, but through a MMS (Mutimedia Message Service) server (not shown). It is also possible to send an MMS message or send an email through an E-Mail server (not shown). In addition, the mobile bill server 120 of the present invention has a function such as the above-described SMS server 150, MMS server, mail server, and transmits a message including a bill guide message and a callback URL to the mobile communication terminal 100 It is also possible.

Here, the mobile bill server 120, the billing history management server 130, the execution application providing server 140 and the SMS server 150 may be implemented as a conventional network server. Network servers are computer systems and computer software that are typically connected to subordinate devices capable of communicating with other network servers through a computer network, such as a private intranet or the Internet, to receive and perform a task request and provide a result of the task. It means (network server program). However, in addition to such a network server program, it should be understood as a broad concept including a series of applications running on a network server and in some cases various databases built therein. Such a network server may be implemented using a network server program that is variously provided according to an operating system such as DOS, Windows, Linux, UNIX, or Macintosh.

2 is a flowchart illustrating a method for providing a mobile billing service according to a preferred embodiment of the present invention.

As shown in FIG. 2, the mobile bill server 120 inquiring mobile subscriber information and billing information data from the billing history management server 130 to generate mobile bill data and obtaining subscriber authentication information for authentication is an SMS server. In step 150, the mobile bill guide message and its URL information are provided to request a short message transmission. Upon receiving the short message transmission request of the mobile bill server 120, the SMS server 150 generates a short message including a bill guide message and a callback URL and transmits the short message to the mobile communication terminal 100 (S200).

The mobile communication terminal 100 receiving the short message from the SMS server 150 receives a password for authenticating the subscriber of the mobile bill service by executing a viewer program installed for the mobile bill inquiry (S202). At this time, if the viewer program is not installed in the mobile communication terminal 100 that has received the short message or if an update is required, the mobile communication terminal 100 to the execution application providing server 140 through the mobile communication network 110. After requesting the latest viewer program, downloading and installing it, the viewer program is executed to input the password.

The viewer program of the mobile communication terminal 100 having received the password requests the bill data by accessing the mobile bill server 120 using the URL included in the short message, and the mobile bill server 120 requests the bill data. The mobile bill data and the subscriber authentication number are transmitted to 100 (S204). The viewer program compares the input password with the subscriber authentication number received from the mobile bill server 120 to determine whether the subscriber authentication (S206).

If the password and the subscriber identification number match, the mobile billing service subscriber is authenticated, and the viewer program uses the received mobile billing data to transfer the mobile bill using the graphic according to a predetermined tag included in the mobile billing data. It outputs on the screen of the terminal 100 (S208). On the other hand, if the password and subscriber authentication number does not match, it is determined that the authentication failed, and the viewer program is terminated without outputting the mobile bill.

In the above description, the password is input immediately after executing the viewer program. However, the password may be input immediately after receiving and storing the mobile bill data or when the mobile bill is requested. Of course, even in this case, the mobile bill data is output only when the subscriber authentication number transmitted together with the mobile bill data and the input password match.

Here, the password and the subscriber authentication number may use the mobile bill subscriber's social security number or business registration number, the registration IP to the billing history management server 130, other passwords, etc. It is also possible to use.

On the other hand, if it is determined that authentication fails because the password and subscriber authentication number do not match in step S206 described above, the user inputs the password again without immediately terminating the viewer program, and if the authentication fails more than a predetermined number of times, the viewer program. It is also possible to set to end. For example, it may be set to terminate the viewer program when the password is given five times and the password is inputted but the authentication fails.

3 is a diagram illustrating an example screen of a process of inquiring a mobile bill.

As shown in FIG. 3, when the mobile communication terminal 100 receives a short message from the SMS server 150 and executes a viewer program, a password input screen as shown in FIG. 3A is provided. In the output screen of FIG. 3A, the back digit of the social security number is set as a password, and if the input back digit of the social security number matches the received subscriber authentication number, the transmitted mobile bill data is displayed on the screen in the format shown in FIGS. do.

When the subscriber authentication is confirmed, the initial screen provides a notice menu as shown in FIG. 3B. The notice menu of FIG. 3B displays notice and key setting information, and selecting 'OK' in the lower right of the screen provides a total billing menu as shown in FIG. 3C. The output screens of FIGS. 3C to 3E have 'previous' and 'next' items respectively on the lower left and right sides, and these items can be selected by using the arrow keys to move to the previous or next menu.

The total billing menu of FIG. 3C includes items such as a customer number, a customer name, a plan, a monthly rate, an unpaid fee, and a total billing fee included in the mobile bill data. When the 'next' is selected on the screen of FIG. 3C, A billing history menu as shown in FIG. 3D is provided. The billing history menu of FIG. 3D includes items such as basic fee, general call fee, information fee, VAT, service fee meter, discount meter, VAT, cut-off amount, and current month meter. If selected, the additional information menu as shown in FIG. 3E is provided. The additional information menu of FIG. 3E includes a payment information menu, a monthly usage status menu, a weekly usage status menu, and an installment information menu. These detailed menus will be described later with reference to FIG. 4.

4 is a diagram illustrating an example screen in which additional information of a mobile bill is inquired.

When the lower menus are selected in the additional information menu of FIG. 3E, the additional information screens of FIGS. 4A to 4D are provided. Selecting 'Back' in the lower left of the screen of FIGS. 4A to 4D moves to the menu of FIG. 3E, which is a higher menu.

4A shows a payment information menu, and includes a term of use, an account / card number, a delivery date, a withdrawal date, an additional withdrawal date, and a creation date item. 4B and 4C are graphs showing monthly usage and weekly usage, respectively, and FIG. 4D provides installment information including an installment period and an installment balance.

The above description is merely illustrative of the present invention, and those skilled in the art to which the present invention pertains may various modifications without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed herein are not intended to limit the present invention but to describe the present invention, and the spirit and scope of the present invention are not limited by these embodiments. It is intended that the scope of the invention be interpreted by the following claims, and that all descriptions within the scope equivalent thereto shall be construed as being included in the scope of the present invention.

As described above, the present invention has an effect of easily inquiring a variety of information related to the usage fee of the subscriber according to a convenient interface provided by the viewer program by outputting a mobile bill using a viewer program installed in the mobile communication terminal. There is.

In addition, by receiving a small amount of mobile bill data consisting of text to provide a multimedia screen using a graphic in the installed viewer program, it is possible to check the billing history colorful and easy to identify, despite the cheap and fast data transfer, Including the subscriber authentication process has the effect of preventing the leakage of the billing information of the subscriber.

Claims (15)

In the method for providing a mobile billing service in a mobile communication system comprising a mobile communication network, a mobile billing server for providing mobile billing data and a running application providing server for providing a viewer program for viewing the mobile bill, (a) the mobile bill server transmitting a message including a bill guide message and a call-back Uniform Resource Locator (URL) to the mobile communication terminal; (b) the mobile terminal receiving the password by executing the viewer program; (c) the mobile communication terminal accessing the mobile bill server using the URL included in the message by executing the viewer program to receive the mobile bill data and the subscriber identification number; And (d) if the password inputted in step (b) and the subscriber authentication number received in step (c) match, the viewer program outputs a mobile bill using the mobile bill data Method for providing a mobile billing service comprising a. The method of claim 1, The message of step (a) is a method for providing a mobile billing service, characterized in that for transmitting a predetermined time or a predetermined time period according to a predetermined message transmission schedule to the mobile communication terminal. The method of claim 1, In step (b), If the viewer program is not installed in the mobile communication terminal or needs to be updated, the mobile terminal service provides a method for downloading and installing a required viewer program from the execution application providing server and executing the viewer program. . The method of claim 1, The viewer program of step (d) checks the tag and the text contained in the mobile bill data, the mobile bill service characterized in that the output of the mobile bill to output the text corresponding to each tag using a graphic How to give it. The method of claim 1, When the storage capacity of the mobile communication terminal is insufficient, the method for providing a mobile billing service characterized in that it deletes the oldest mobile bill data received and stored the longest and stores the mobile bill data in the mobile communication terminal. The method of claim 1, And the mobile bill data is stored in the mobile communication terminal to output the mobile bill using the mobile bill data through the viewer program even after receiving the mobile bill data. The method of claim 1, The method, (e) In step (d), if the password and the subscriber authentication number do not match, it is determined that authentication fails and the password is input again. If authentication fails more than a predetermined number of times, the mobile bill is not output. Terminating the viewer program without Method for providing a mobile bill service, characterized in that it further comprises. In the system for providing a mobile bill service for providing a mobile bill data to the mobile communication terminal to look up through a mobile communication network, A mobile bill server for transmitting a message including a bill guide message and a call-back Uniform Resource Locator (URL) to the mobile communication terminal and providing the mobile bill data and the subscriber identification number to the mobile communication terminal; And Is executed in the mobile communication terminal to receive a password, access the mobile bill server using the URL included in the message, receive the mobile bill data and the subscriber authentication number, and authenticate the password and the subscriber. Execution application providing server for providing the mobile communication terminal with a viewer program for outputting a mobile bill using the mobile bill data if the numbers match. System for providing a mobile billing service comprising a. The method of claim 8, The system, A billing history management server that classifies and stores mobile subscriber information and billing information data, and receives the inquiry request from the mobile bill server and provides the mobile subscriber information and billing information data. The system for providing a mobile billing service, further comprising a. The method of claim 8, When the execution application providing server receives a viewer program transmission request or a viewer program update (confirmation) request from the mobile terminal receiving the message, the execution application providing server includes one or more corresponding viewer program, update patch program, or update confirmation result data. System for providing a mobile billing service, characterized in that for transmitting to the mobile communication terminal. The method of claim 8, The viewer program is a system for providing a mobile bill service, characterized in that for checking the tag and the text contained in the mobile bill data and outputs the mobile bill to output the text corresponding to each tag using a graphic. The method of claim 8, The viewer program determines that authentication fails if the password and the subscriber authentication number do not match, and receives the password again, but if the authentication fails more than a predetermined number of times, ends without outputting the mobile bill. The system for providing a mobile billing service. The method of claim 8, The mobile communication terminal provides a mobile bill service, if the storage capacity is insufficient, deletes the oldest mobile bill data received and stored the longest and stores the mobile bill data. The method of claim 8, The mobile communication terminal stores the received mobile bill data and outputs the mobile bill using the mobile bill data through the viewer program even after receiving the mobile bill data. . The method of claim 8, The mobile communication terminal is equipped with a virtual machine (VM) for executing the viewer program, the virtual machine is a GVM (General VM), SK-VM, KVM (Kilobyte VM) and Wifi (WIPI: Wireless) Internet Platform for Interoperability) system for providing a mobile billing service, characterized in that it comprises at least one.

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