KR20030057098A - Method of WML encoding for large-size data transmission - Google Patents

Abstract

PURPOSE: A WML(Wireless Markup Language) encoding method for transmitting high-capacity data is provided to encode data as well as tag and attribute command information if size of data configured in WML is big, and to transmit the encoded data, thereby reducing transmission time of the data. CONSTITUTION: If a user requests contents data(S101), a WAP gateway transmits the request to a web server. The web server configures corresponding contents in WML and WML script, and transmits the contents to the WAP gateway(S102). The WAP gateway removes an undefined tag, an attribute command, and a space(S103), and replaces the tag and the attribute command with binary values(S104). After completing encoding of the tag and the attribute command, the WAP gateway compresses data(S105), and transmits encoded data to a user through a wireless network(S106).

Description

Method of WML encoding for large-size data transmission

The present invention relates to a method of encoding WML (wireless markup language), which is a language used in a wireless Internet environment. In particular, when the size of the WML data is large, not only tag and attribute command information but also data are encoded and transmitted. The present invention relates to a WML encoding method for high capacity data transmission, which provides an effective encoding method that can reduce a transmission time even when data is large.

WML is a language used in wireless Internet environment based on wireless application protocol (WAP). It is a markup language based on extensible markup language (XML). It is a language designed for determining and displaying content.

Devices that do not support wireless Internet generally have considerably smaller display screens to display content, less memory for computing, and poor CPU performance. Also, because of low bandwidth and unstable access, WML is a language designed to support devices with this feature.

Referring to the configuration of the WAP environment using the above WML as follows.

1 is a block diagram showing a WAP-based wireless Internet configuration.

Referring to FIG. 1, a client 10 such as a mobile phone and a PDA supporting wireless Internet, a web server 30 providing information requested by the client 10, and a request for information from the client 10. The WAP gateway 20 transmits a message to the web server 30, encodes WML data transmitted from the web server, and transmits the message to the client 10.

In particular, the client 10 provides a WML 11 for interpreting and displaying the WML language to the user, a WML script 12, and a WTAI (wireless) that provides an interface for enabling not only data but also voice communication wirelessly. telephony application interface (13), and other (14) devices and programs, the WAP gateway 20 includes an encoder / decoder 21 for compressing and decompressing WML data, and a WML script compiler 22 And a protocol adapter 23 for other protocol extensions.

In addition, the web server 30 includes a database 32 storing content information requested by the client, a WML deck 33 for processing the content into a WML deck form that can be recognized by the client, It is configured to include a CGI script 31 which is a kind of server side script. In this case, the WML deck represents a basic unit transmitted between the terminal and the server, and may correspond to one page of the Internet HTML.

In the wireless Internet environment having the above configuration, the WML data can be transmitted and received between the client 10 and the web server 30 because the WAP gateway 20 encodes and decodes each other.

The encoding / decoding method will be described in more detail as shown in FIG. 2, and FIG. 2 is a flowchart of a conventional WML encoding / decoding method.

Referring to FIG. 2, the WAP gateway receiving the encoded content request message from the client 10 (S11) is a CGI script 31 of the web server 30, and URL information of the content desired by the client 10. If the request is sent by sending (S12), and the web server 30 writes the corresponding content information into a WML document and transmits it (S13), the WML gateway encodes the WML document and transmits it to the client 10 ( S14).

At this time, the encoding method is to delete the tags and attribute instruction parts that are not necessary in the WML document, remove the spaces, define the tags and attribute instructions as binary codes, compress them, and transmit them together with the data to the client.

This method uses WMP as a language consisting of tags, attribute instructions, and data in the characteristics of WML. Since the number of instructions for the tags and attributes is limited, the method is defined as a constant value and compressed. To transmit.

Accordingly, the WAP gateway 20 removes unnecessary tag and attribute instructions from the web server 30 content information written in WML, minimizes tags and attributes by removing spaces, and then binary for each tag and attribute instruction. By defining a code and transmitting the data to the client 10, the size of the data is reduced.

However, the conventional encoding method may be efficient when the data size is small and there are many tags and attribute instructions. However, when the data size is large enough to occupy most of the document, the data is compressed enough to compress the tags and attribute instructions. Since the size of the device cannot be significantly reduced, a lot of time is required to transmit to the client, which causes the user to wait for a long time to receive the content.

In order to solve the above problems, the present invention allows the data to be compressed using a general-purpose compression algorithm in a method of encoding only tags and attributes as in the prior art, thereby increasing the size of the WML document when the data size is large The purpose of the present invention is to provide a WML encoding method for high capacity data transmission, which reduces the time required for transmission, thereby reducing service latency due to data transmission.

1 is a block diagram showing a WAP-based wireless Internet configuration.

2 is a flow chart of a conventional WML encoding / decoding method.

3 is a block diagram illustrating a configuration of a content encoding model of a WML encoding method for high capacity data transmission according to an embodiment of the present invention.

4 is a diagram illustrating an example of a tag and attribute instruction conversion structure according to an embodiment of the present invention.

5 is a flowchart illustrating an operation procedure of a WML encoding method for high capacity data transmission according to an embodiment of the present invention.

WML encoding method for high capacity data transmission according to the present invention,

Transmitting a data request message by a user's input to a WAP gateway in a device supporting wireless Internet, and transmitting the request message from the WAP gateway to a web server;

Retrieving the corresponding content from the web server according to the request message, and configuring the corresponding content data into a WML and a WML script and transmitting the same to the WAP gateway;

Removing undefined tag and attribute instructions from WML and WML scripts received at the WAP gateway, removing spaces, and converting the tag and attribute instructions to binary values;

Encoding, at the WAP gateway, the data portion in the WML and WML script by a general-purpose compression algorithm, and transmitting the encoded data along with the tag and attribute instructions converted into the binary values to the wireless Internet support device through a wireless network. Characterized in that it comprises a.

The WML encoding method for high capacity data transmission according to the present invention configured as described above will be described with reference to the accompanying drawings.

3 is a block diagram illustrating a configuration of a content encoding model of a WML encoding method for high capacity data transmission according to an embodiment of the present invention.

Referring to FIG. 3, when the WAP gateway encodes WML and WML scripts, the content information requested by the client 100 is configured and transmitted as a WML file by the web server 300, and the WML file is transmitted by the WAP gateway 200. After removing the spaces of the tag and the attribute instruction (210), converting the binary values of the tag and the attribute instruction (230), and compressing the data by the universal compression algorithm (240), through the wireless network To the client 100.

4 shows an example of converting the tag and the attribute command to binary values.

4 is a diagram illustrating an example of a tag and attribute instruction conversion structure according to an embodiment of the present invention.

Referring to FIG. 4, since tag and attribute instructions are defined in a limited number, the size is reduced by replacing each with a binary value (231, 232).

The encoding process as described above is described in more detail as follows.

5 is a flowchart illustrating an operation procedure of a WML encoding method for transmitting high capacity data according to an exemplary embodiment of the present invention.

Referring to FIG. 5, when a user requests content data desired by a client device supporting wireless Internet (S101), the WAP gateway 200 transmits the request to the web server 300.

According to the request, the web server searches for the corresponding content, configures the WML and WML script, and transmits the content to the WAP gateway 200 (S102).

Upon receiving the WML file, the WAP gateway 200 removes an undefined tag, an attribute command, and a space (S103). In this case, the space removal is to remove unnecessary spaces and meta information such as tabs, new lines, carriage returns, and the like, and is a task for constructing the most compact data without losing the meaning of the file.

When the space is removed as described above, the tag and the attribute instruction are replaced with a binary value (S104). As described above, since the tag and the attribute instruction are limited, the tag and attribute instruction may be replaced with a binary token value.

When the encoding of the tag and the attribute instruction is completed as described above, the data is compressed (S105). In this case, as a general-purpose compression algorithm used for compression, an algorithm generally used is RLE (run-length encoding), Huffman, Encoding can be accomplished using a combination of basic algorithms such as applied Huffman, Arithmetic Obligation, and LZW.

When the tag, the attribute instruction and the data is encoded as described above, the encoded data is transmitted to the user through the wireless network (S106) to provide contents.

As described above, if the data is compressed and transmitted as well as tags and attribute commands, the size of the file is greatly reduced, thereby reducing the waiting time by reducing the time for the user to receive the data for service use.

As described above, in the WML encoding method for transmitting a large amount of data according to the present invention, in transmitting a WML document to a client through a wireless network, the WML encoding method reduces the waiting time for accessing the Internet by reducing the file size as much as possible. By this effect, not only text documents and still images but also various services such as a video or animation service having a large data size can be provided in a wireless Internet environment.

Claims (1)

Transmitting a data request message by a user's input to a WAP gateway in a device supporting wireless Internet, and transmitting the request message from the WAP gateway to a web server; Retrieving the corresponding content from the web server according to the request message, and configuring the corresponding content data into a WML and a WML script and transmitting the same to the WAP gateway; Removing undefined tag and attribute instructions from WML and WML scripts received at the WAP gateway, removing spaces, and converting the tag and attribute instructions to binary values; Encoding, at the WAP gateway, the data portion in the WML and WML script by a general-purpose compression algorithm, and transmitting the encoded data along with the tag and attribute instructions converted into the binary values to the wireless Internet support device through a wireless network. WML encoding method for high capacity data transmission, characterized in that it comprises a.