WO2009067947A1

WO2009067947A1 - Device maintaining method, system and device thereof

Info

Publication number: WO2009067947A1
Application number: PCT/CN2008/073130
Authority: WO
Inventors: Jun Zhou; Jianzhong Yao
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-11-23
Filing date: 2008-11-20
Publication date: 2009-06-04

Abstract

A device maintaining method comprises: reading the maintenance control files from an outside storage apparatus through a common physical interface; automatically executing a maintenance operation according to the commands of the maintenance control files. A system and device use the method. The present invention could complete maintenance operations automatically on the device-near side, without additional computer, and without additional manual operation, thereby reducing the maintenance cost.

Description

Equipment Maintenance Method, System and Apparatus This application claims the Chinese application filed on November 23, 2007, with the application number of 200710186897.1, the invention titled "Base Station Test Method, System and Base Station," and November 23, 2007 The priority of the Chinese patent application is hereby incorporated by reference.

The present invention relates to communication technologies, and in particular, to a device maintenance method, system, and device. Background technique

In the communication network, the communication equipment maintenance methods mainly include remote maintenance and near-end maintenance. Remote maintenance is mainly performed by the NMS or the maintenance terminal accessing the communication device through the intranet or the Internet to maintain the communication device. Near-end maintenance The maintenance terminal accesses the communication device through the local maintenance network port of the communication device, thereby maintaining the communication device.

The maintenance terminal is usually a laptop with maintenance software installed. Maintenance personnel can perform maintenance functions such as software upgrade, data download, and communication device detection through the maintenance terminal.

In the process of implementing the present invention, the inventors found that the prior art has the following disadvantages:

In terms of maintenance of communication devices, especially wireless base stations, the above-mentioned conventional maintenance methods require a high level of knowledge for maintenance personnel. For example, after the wireless base station is installed, it needs to perform near-end soft adjustment to ensure the correctness of hardware installation. This process generally requires special personnel to perform debugging. In this way, an additional process is added to the field installation, and the complexity is increased. Moreover, commissioning costs are also relatively expensive. In Europe, if commissioning by a third-party partner company does not include the cost of commissioning a base station, it will cost 600 Euros. Therefore, how to effectively reduce the commissioning cost has become one of the focuses of wireless base station serviceability design. Summary of the invention

Embodiments of the present invention provide a device maintenance method, system, and device for use in a cylinder maintenance operation. Reduce commissioning costs.

An embodiment of the present invention provides a device maintenance method, including:

Reading the maintenance control file from the external storage device through the general physical interface;

The maintenance operation is automatically performed according to the command of the maintenance control file.

An embodiment of the present invention provides an equipment maintenance system, including an external storage device and a maintenance device installed on the device end, where the maintenance device includes:

a common physical interface and a detection module, wherein the detection module is configured to detect whether the universal physical interface is connected to an external storage device;

a reading module, configured to: after the detecting module detects that the external storage device accesses the universal physical interface, read at least one maintenance control file from the external storage device;

The maintenance execution module is used to maintain the device according to the maintenance control file read by the reading module from the external storage device.

An embodiment of the present invention provides an apparatus, including:

Supporting a general physical interface and a detection module of the external storage device, wherein the detection module is configured to detect whether the universal physical interface is connected to the external storage device;

According to the device maintenance method and system according to the embodiment of the present invention, the external storage device is used to transmit the control file to the device, and the device automatically reads and completes the near-end maintenance work, thereby greatly reducing the maintenance workload and reducing the workload. The cost of maintenance. DRAWINGS

1 is a flowchart of a method for maintaining a communication device according to an embodiment of the present invention; FIG. 2 is a flowchart of a maintenance example for performing a reverse maintenance log for a communication device according to an embodiment of the present invention; 3 is a schematic diagram of a communication device maintenance system according to an embodiment of the present invention;

Figure 4 is a schematic structural view of the external storage device of Figure 4;

5 is a schematic structural diagram of a maintenance device of a communication device maintenance system according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a maintenance device provided with a data interaction module according to an embodiment of the present invention; Maintenance flow chart;

FIG. 8 is a schematic diagram of a system for performing maintenance on a base station according to an embodiment of the present invention. detailed description

The embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be noted that the following description is made by taking a communication device as an example, but the method and system of the present invention are not limited to application to a communication device, and other devices requiring near-end maintenance may also adopt the method and method of the present invention. system.

1 is a flow chart of a method of maintaining a communication device in accordance with an embodiment of the present invention.

There is a communication device unit in the communication device. In addition to performing control of the communication device and communication device functions, the communication device unit has a function of performing a maintenance operation on the communication device.

The method for maintaining a communication device in the embodiment of the present invention includes the following steps:

Specifically, see Figure 2:

5201, setting a general physical interface supporting the external storage device on the communication device unit of the communication device;

5202. Store at least one maintenance control file in an external storage device that supports a general physical interface.

S203, connecting the external storage device to the general physical interface, specifically, inserting the external storage device into the general physical interface, and the communication device unit reads the maintenance control file from the external storage device and automatically executes according to the command of the maintenance control file. Maintenance operations. The general physical interface on the communication device unit can be, for example, a USB interface, an Ethernet interface, or a card reader interface. The portable external storage device can be, for example, a USB flash drive, a CF card, an MS card, an MD card, an SD card, or an SM card.

It can be understood that the insertion of the external storage device into the general physical interface is one of various connection modes of the external storage device and the general physical interface, and the connection manner of the two is not limited to the insertion.

Maintenance control files are edited in advance by off-site maintenance control centers based on tasks that need to be maintained, and can be edited using a common or custom scripting language.

The external storage device has portability and can be carried to the site by the maintenance personnel, or can be sent to the communication device site by other means. After the communication device is successfully installed and powered on, the external storage device is inserted into the general physical interface of the communication device unit. .

The communication device unit of the communication device can automatically detect whether the external storage device is inserted into the general physical interface of the communication device unit of the communication device, and if the external storage device is detected to be inserted, the communication device unit reads the maintenance control file from the external storage device and according to the command The file automatically performs maintenance operations.

Maintenance data can also be saved in the external storage device, and the maintenance data includes software packages and logs. During the maintenance operation, if it is necessary to import data from an external storage device, such as a software version, the communication device unit can read the maintenance data from the external storage device according to the script command.

During the maintenance operation, if the communication device needs to output relevant data, the communication device unit outputs the relevant data of the communication device to the external storage device, and can bring the external storage device back to the maintenance control center for subsequent analysis of the relevant data. .

2 is a flow chart showing an example of maintenance of a reverse maintenance log of a communication device according to an embodiment of the present invention.

In the embodiment shown in FIG. 2, the external storage device (USB or CF card) and the maintenance control file are used, and the log data of the communication device is automatically exported at the near end. After detecting that the external storage device is inserted, the communication device parses the corresponding control file and executes a command to control the file to complete the data export.

A communication device is a distributed system in which a communication device unit and a service unit are present. As shown in Figure 3, The specific scheme for performing reverse maintenance logs on communication devices is as follows:

In step S301, a common physical interface is designed on the board where the communication device unit of the communication device is located, and the universal physical interface supports an external storage device (such as a USB, a CF card, etc.), and the communication device can automatically detect the external storage device. Insertion.

In step S302, the control file is stored in advance on the external storage device. The file name and storage path of the control file need to be fixed. As shown in Figure 3, the control file name is Icf.ini and the storage path is the root directory.

In step S303, the communication device automatically reads the control file upon detecting the insertion of the external storage device. In the example shown in Figure 2, the command set for exporting data is described in the control file. The communication device acquires the type of data to be exported according to the control file; the data type needs to be defined in advance, and the communication device software needs to be able to know from the data type where the data is obtained and the corresponding file name; the control file needs to describe the name and storage location of the exported data. . If the name has not changed, you can leave it blank.

In step S304, the communication device derives data according to the command of the control file and indicates the completion process of the user data export. That is, when the data export process is started, the communication device prompts the user for the current data export status through the indicator light, for example: the flashing light indicates that data export is in progress, and the flashing light indicates that the export is completed.

In step S305, the indicator light flashes slowly, indicating that the maintenance data has been exported, and the maintenance personnel removes the external storage device from the general physical interface.

In step S306, the maintenance personnel sends the external storage device to the maintenance control center for subsequent sub-distribution. In the example shown in FIG. 2, a typical Icf.ini file format can be as follows (the specific format may not be limited to the following structure):

[Data Description]

Data Type = RunLog

Data Destination = ./log/runlog/Runlog.dat

[Data Description]

Data Type = Oplog Data Destination = ./log/ Oplog/ Oplog .dat

[Data Description]

Data Type = TraceLog

Data Destination = ./log/Tracelog/ //No specific file name indicates the same name as the source file

3 is a schematic diagram of a communication device maintenance system in accordance with an embodiment of the present invention.

As shown in FIG. 3, the communication device maintenance system includes a maintenance device 401 and an external storage device 402. The maintenance device 401 is mounted on the communication device and has a general physical interface 403 that supports an external storage device. The maintenance control file and related maintenance data generated by the maintenance control center are stored in the external storage device 402.

4 is a schematic structural view of the external storage device 402 of FIG. As shown in FIG. 4, the external storage device 402 includes a maintenance control file storage area and a data area, and the data area is divided into a plurality of sub-data areas, such as a sub-data area 1, a sub-data area 2, ... a sub-data area n. The sub data area is used to store different data files.

FIG. 5 is a schematic structural diagram of the maintenance device 401 of FIG. 3. As shown in FIG. 5, the maintenance device 401 further includes:

The detecting module 601 is configured to detect whether the external storage device 402 is inserted into the general physical interface 403. The reading module 602 is configured to read the maintenance control from the external storage device after the detecting module 601 detects that the external storage device is inserted into the universal physical interface 403. File; and

The maintenance execution module 603 is configured to perform maintenance on the communication device according to the maintenance control file read from the external storage device by the reading module 602.

Using the communication device maintenance system of FIG. 3, the maintenance control center edits the maintenance control file in advance according to the task to be maintained, and can be edited using a general or custom scripting language. The external storage device 402 is sent to the communication device site, and after the communication device is successfully installed and powered up, the external storage device 402 is inserted on the general physical interface 403 of the maintenance device 401. The detection module 601 of the maintenance device 401 detects whether the external storage device is inserted into the general physical interface. After the detecting module 601 detects that the external storage device is inserted into the general physical interface, the reading module 602 of the maintenance device 401 reads the maintenance control file from the external storage device 402. The maintenance execution module 603 of the maintenance device 401 stores the external storage according to the reading module. The maintenance control file read in the storage device performs near-end maintenance on the communication device.

In addition, when the maintenance control file is stored in the external storage device 402 in the maintenance control center, corresponding maintenance data such as a software package and a log may be separately stored in the plurality of data areas of the external storage device 402. Corresponding to this, as shown in FIG. 6, a maintenance unit 604 may be further provided in the maintenance device 401, for reading maintenance data from the maintenance data area of the external storage device or outputting related data of the communication device. To the predetermined data storage area of the external storage device.

FIG. 6 shows the structure of the maintenance device 401 provided with the data interaction module 604. As shown in FIG. 6, the maintenance device 401 further includes a data interaction module 604 whose general physical interface 403 performs data interaction with the external storage device 402. During the maintenance operation, if it is necessary to import data from the external storage device 402, such as a software version or the like, the data interaction module 604 can read the maintenance data from the external storage device 402 according to the maintenance command.

Moreover, during the maintenance operation, if the communication device needs to output relevant data, the data interaction module 604 outputs the relevant data of the communication device to the corresponding data area of the external storage device 402. The external storage device 402 can be brought back to the maintenance control center for subsequent analysis of related data.

According to the present invention, a method and system for maintaining a communication device, using an external storage device and a control file to complete the near-end maintenance function of the communication device, without a notebook computer, and without special personnel for debugging, the hardware installation worker This can be done, which can greatly reduce the cost of near-end maintenance.

The communication device in the above embodiment may be a base station. The base station is a basic unit constituting a cell in mobile communication, and completes communication and management functions between the mobile communication network and the mobile communication user. The generalized base station is a cartridge of a BSS (Base Station Subsystem). Take the GSM (Global System For Mobile Communication) network as an example, including BTS (Base Transceiver Station) and BSC (Base Station Controller). A base station controller can control ten to dozens of base transceiver stations. In systems such as WCDMA (Wideband Code Division Multiple Access), similar concepts are called NodeB (Evolution Node) and RNC (Radio Network Controller, Wireless Network). Network controller). A narrow base station, that is, a public mobile communication base station, is a form of a radio station, and refers to a radio transceiver station that performs information transmission with a mobile telephone terminal through a mobile communication switching center in a certain radio coverage area. The base station is requested by the mobile communication carrier to set up.

The construction of mobile communication base stations is an important part of the investment of mobile communication operators in China. The construction of mobile communication base stations generally involves elements such as coverage, call quality, investment efficiency, construction difficulty, and easy maintenance. With the development of mobile communication network services in the direction of data and packetization, the development trend of mobile communication base stations must also be broadband, large coverage construction and IP (Internet Protocol).

Since the base station is a mass product, installation and maintenance need to be as simple as possible to reduce the requirements for the installer. After the base station is installed, testing is required to ensure that the hardware is installed in place to avoid cost increases caused by secondary stations. Bright. A method for commissioning a base station according to an embodiment of the present invention performs near-end maintenance of a base station by reading and executing a maintenance control file saved by a storage device, that is, an automatic test program, when performing commissioning at the near end of the base station. The test is performed and the execution result is recorded by the storage device, thereby reducing the technical requirements for the field installation tester. The test method provided by the embodiment of the present invention can be used not only for a base station, but also for other complicated devices that require batch installation and commissioning, and where maintenance locations are dispersed.

As shown in FIG. 7, a flowchart of a method for commissioning a base station according to an embodiment of the present invention specifically includes the following steps:

Step S801, the base station reads the maintenance control file pre-stored in the external storage device, and the maintenance control file may be an automatic test program. An automatic test program is generated to be written to the external storage device at a remote end of the maintenance control center according to the hardware configuration of the base station. The external storage device may be a portable external storage device such as a USB flash drive or an SD card. The embodiment of the present invention uses a USB flash drive as an example for description. The base station reads the automatic test program pre-stored in the external storage device, and may automatically read the automatic test program pre-stored in the external storage device when the base station detects that the external storage device is accessed, or may receive an indication at the base station. After the signal, the pre-stored automatic test program in the external storage device is read. Step S802, the base station executes the maintenance control file, and outputs an execution result of the maintenance control file. On the master device of the base station, such as the main control board, add a common physical interface, such as a USB (Universal Serial Bus) interface, so that the external storage device can be connected to the base station. Of course, the general physical interface is not limited. The USB interface, any modification that allows the external storage device to be connected to the base station, falls within the scope of protection of the embodiments of the present invention. When the base station is tested, the storage device storing the automatic test program is inserted into the interface, and the base station is connected to the external storage device for communication. After identifying the external storage device, the base station automatically reads the automatic test program pre-stored in the external storage device, and then sequentially executes the automatic test program. After executing the automatic test program, the execution result is written to the external storage device. Defining a globally unique identifier for each base station, the base station performs the "global unique identifier + execution result" in the manner of writing the execution result, so that different base stations can be distinguished according to the global unique identifier when reading the execution result, and After the writing operation to the execution result is completed, the base station issues a prompt message prompting the base station to complete the writing operation of the execution result. In this way, the execution result saved by the external storage device can be read from the display screen by the reading device. By analyzing the execution result, it is possible to know whether the base station has an installation problem, and can quickly locate a problematic board or connection in the routine maintenance of the base station.

The reading device can be used separately from the external storage device or integrated with the external storage device. The reading device and the external storage device are used separately to facilitate obtaining from the existing device, and the integrated use of the reading device and the external storage device is a dedicated reading device, which can perform necessary pre-processing on the execution result recorded by the external storage device, thereby Make the display and operation of the data more convenient.

In the method of base station testing according to the embodiment of the present invention, the base station reads and executes the maintenance control file pre-stored by the external storage device at the near end, and outputs the execution result to the external storage device. By reading the execution result, it is convenient to judge whether the base station has an installation problem. In the routine maintenance, you can quickly locate the faulty boards or cables through the execution result, which facilitates timely troubleshooting and ensures the normal operation of the base station. Thereby, the maintainability of the base station is improved, the process of installing and testing the base station is accelerated, and the technical requirements for the installation and maintenance personnel of the base station are reduced, that is, the maintenance work of the base station is reduced and the commissioning cost is reduced.

The following is a method for applying a base station commissioning method to a base station installation scenario according to an embodiment of the present invention, where Body includes:

After the base station is installed and powered on, first confirm whether the basic connection is normal according to the indicator. The base station is then coupled to an external storage device via a common physical interface on the base station, and the base station communicates with an external storage device. After the external storage device is identified, the base station automatically reads and sequentially executes the installation test program pre-stored on the external storage device at the near end, and writes the execution result to the external storage device after the execution is completed. The installation test procedure is generated in advance based on the hardware configuration of the base station at the remote end of the maintenance control center. After the writing of the execution result is completed, the base station issues a prompt message, for example: prompting the writing by the change of the color of the indicator light. A globally unique identifier is defined for each base station, and the base station performs the "global unique identification + execution result" in the manner of writing the execution result, so that different base stations can be distinguished according to the global unique identifier when reading.

The external storage device is taken out, the execution result is read by the universal reading device, and the installation result is analyzed to determine whether there is an installation problem. If there is an installation problem, the problem is corrected according to the operation prompt information and then the above process is repeated. The operation prompt information may be on paper or directly displayed on the reading device according to the user's selection.

Confirm that the base station is installed without problems and leave the site.

Each time a batch of base stations is installed and returned to the centralized maintenance point, information from external storage devices of different installation teams is imported into the computer for detailed analysis. For example: The error-prone points during the installation process can be analyzed based on historical error information recorded by the external storage device to improve the design of the subsequent base station.

The following is the operation of the method for the base station commissioning in the routine maintenance of the base station in the embodiment of the present invention, which specifically includes:

In the subsequent routine maintenance of the base station, if the remote maintenance cannot be performed because the transmission fails, the professional maintenance personnel can load the positioning test program in the external storage device, and then the general technician can operate to the near end to complete the maintenance. The process also reduces the technical requirements for technicians, ie, cylinder maintenance work and reduces commissioning costs.

When performing the near-end operation, it is first determined whether the base station is powered down. If the power is lost, the base station is powered on first. Then, the storage device is inserted into the storage device interface on the base station host device, and the base station starts to communicate with the external storage device. After identifying the external storage device, the base station automatically reads and sequentially executes the positioning test program loaded in the external storage device, and then The execution result is written to the external storage device in the format of "Global Unique ID + Execution Result". After the writing operation to the execution result is completed, the base station issues a prompt message, for example: prompting the writing by the change of the color of the indicator light. The execution result includes positioning information required for subsequent analysis of problems occurring at the base station. For common problems, the base station simultaneously gives operation prompt information, which may be on paper or directly displayed on the reading device. After further maintenance operations based on the operation prompts, if the problem still cannot be solved, bring the storage device back to the maintenance control center. Professional maintenance personnel import the information recorded by the external storage device into the computer for detailed automatic and manual analysis to determine the problem. When performing the near-end maintenance on the base station next time, perform the actual operation according to the expert's suggestion to eliminate the fault and restore the normal operation of the base station.

As shown in FIG. 8, the structure diagram of the system used for the base station commissioning method includes an external storage device 901, and further includes: a base station 902 connected to the external storage device 901, configured to read and execute the pre-stored in the external storage device 901. The automatic test program outputs the execution result of the automatic test program to the external storage device 901. Of course, the execution result can also be written into another storage device, which does not affect the implementation of the embodiment of the present invention, and is still within the protection scope of the embodiment of the present invention.

The base station commissioning system further includes: a reading device 903, configured to be connected to the external storage device 901, for reading the execution result saved by the storage device 901.

The system tested by the base station may further include: an analyzing device 904, configured to analyze the execution result read by the reading device 903.

The base station 902 includes: a read ear module 9021, configured to read an automatic test program pre-stored in the external storage device 901;

The maintenance execution module 9022 is connected to the reading module 9021 and configured to execute an automatic test program read by the reading module 9021.

The data interaction module 9023 is connected to the maintenance execution module 9022 for outputting the execution result of the automatic execution program by the maintenance execution module 9022 to the external storage device 901. The base station 902 further includes: a status indication module 9024, coupled to the data interaction module 9023, configured to send a prompt message after the data interaction module 9023 completes the write operation of the execution result, prompting that the writing operation to the execution result is completed.

The base station 902 can also include a general purpose physical interface 9025 for accessing the external storage device 901. When the base station automatically reads the automatic test program pre-stored in the external storage device 901, the base station 902 further includes a detection module 9026 for identifying the access of the external storage device 901 and starting the reading module 9021 for the read operation. When the base station 902 performs a read operation for receiving the indication, the detecting module 9026 is further configured to identify an instruction to read the external storage device 901, and activate the reading module 9021 to perform a read operation.

The base station 902 reads and executes the automatic test program pre-stored by the external storage device 901, and outputs the execution result to the external storage device 901. The execution result can be read by the near-end reading device 903, and the near-end analysis device 904 analyzes the execution result to confirm whether the installation of the base station 902 is correct, whether a failure or the like occurs during operation. Thereby, the process of testing the base station 902 is reduced, the test cost is reduced, and the technical requirements for the installation tester are reduced, that is, the maintenance work is reduced and the commissioning cost is reduced.

It is obvious that the above method and system for base station commissioning can also be applied to other communication devices or complex devices with dispersed maintenance locations.

Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform the methods described in various embodiments of the present invention.

The above disclosure is only a few specific embodiments of the present invention, and it is obvious that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention. Thus, if the modifications and variations of the present invention fall within the scope of the claims and the equivalents thereof, the present invention Also intended to include these changes and variations

Claims

Rights request

A device maintenance method, comprising:

2. The device maintenance method according to claim 1, wherein before the reading of the maintenance control file from the external storage device through the universal physical interface, the method includes:

Setting a general physical interface supporting the external storage device on the device;

Preserving at least one maintenance control file in an external storage device supporting the general management interface; connecting the external storage device to the general physical interface.

The device maintenance method according to claim 2, wherein the connecting the external storage device and the universal physical interface specifically includes:

The external storage device is inserted into the general physical interface.

The device maintenance method according to claim 2 or 3, wherein the storing the at least one maintenance control file in the external storage device supporting the general physical interface comprises:

The maintenance control file is generated according to the hardware configuration of the device, and is saved in the external storage device.

The device maintenance method according to claim 2 or 3, wherein the external storage device further stores maintenance data, and the device reads from the external storage device during the maintenance operation. Take maintenance data.

The device maintenance method according to claim 2 or 3, further comprising: in the maintenance operation, if the device needs to output relevant data, the device outputs the related data to the external storage device. .

The device maintenance method according to claim 2 or 3, wherein the maintenance control file is compiled in a scripting language.

The device maintenance method according to claim 2 or 3, wherein the device reads the maintenance control file from the external storage device, specifically:

The device identifies and automatically reads an automatic test program pre-stored in the external storage device.

Replacement page

The device maintenance method according to claim 2 or 3, wherein the device is a base station, and the external storage device is a portable portable storage device.

A device maintenance system, comprising: an external storage device and a maintenance device installed at the device end, wherein the maintenance device comprises:

The device maintenance system according to claim 10, wherein the maintenance device further comprises: a data interaction module, configured to read maintenance data from the external storage device or output related data of the device to In the external storage device.

The device maintenance system according to claim 10 or 11, wherein the device is a base station, and the universal physical interface is a USB interface, an Ethernet interface or a card reader interface.

13. An apparatus, comprising:

Universal physical interface for supporting external storage devices;

a detecting module, configured to detect whether the universal physical interface is connected to the external storage device, and a reading module, configured to read from the storage device after the detecting module detects that the external storage device accesses the universal physical interface At least one maintenance control file;

The device according to claim 13, further comprising: a data interaction module, configured to read maintenance data from the external storage device or output relevant data of the device to the external storage device.

The device according to claim 13 or 14, wherein the device is a base station, The external storage device is a portable portable storage device, and the general physical interface is a USB interface, an Ethernet interface, or a card reader interface.