KR20010029044A - Method for servicing time information by using a jini - Google Patents

Abstract

PURPOSE: The method for offering a time information service using the Jini is provided to synchronize the time of a personal digital assistant and a computer system in accordance with accurate standard time information by installing the Jini program in the personal digital assistant. CONSTITUTION: A user connects to a network using a modem mounted on a personal digital assistant(PDA)(201). The user searches a look-up service for receiving a time information service(202). The personal digital assistant searches a look-up server, and reads kinds of service offered from the look-up server(203), and requests a service corresponding to the read kind of service to the look-up server. If the kind of service offered by the look-up server is a time information service, and the user demands for the time information service(204), the time information service is requested to the look-up server(205). The look-up server received a time information service request from the personal digital assistant offers a proxy with respect to a time information server registered to the own to the personal digital assistant(206). The personal digital assistant calls the second time information server using the proxy through the look-up server and requests a transmission of time information through the second time information server(207). The second time information server responds to a demand of the personal digital assistant and searches time information and transmits the searched information to the personal digital assistant(208). The personal digital assistant synchronizes system time in accordance with the transmitted time information.

Description

How to provide time information service using Genie {METHOD FOR SERVICING TIME INFORMATION BY USING A JINI}

The present invention is equipped with a Java application (Jini) is mounted on a personal digital assistant (PDA, hereinafter referred to as PDA) or a personal computer (PC, hereinafter referred to as PC) The present invention relates to a time information service method using a genie for servicing time information.

As is well known, PDAs come in a variety of sizes, ranging from the size of a person's palm or a size of a notebook, to inputting information by writing letters one by one on a screen made of liquid crystal using a device such as a pen instead of a keyboard. It is a portable information terminal that can edit and communicate.

The PDA is composed of CPU, RAM, ROM like a computer, and has a PDA program written in C language. It can transfer data input from the PDA to the computer and vice versa. have.

In addition, the PDA can communicate with the Internet using infrared communication, serial port communication, and an external modem of a computer, and can even transmit faxes.

In recent years, attempts have been made to mount a Java virtual machine (JVM) on such PDAs, which are intended to enable the execution of Java applications on a PDA by mounting the Java virtual machine.

Because Java applications are very portable, there is an advantage that programs developed on one system work the same on other systems.

One of these Java applications, Genie, is a Java-based network distribution technology that enables the identification of peripheral devices in a network regardless of protocols. It is a single network for home appliances such as PCs, peripherals, mobile phones, pagers, and home appliances. It can be controlled in the environment, and in particular, there is an advantage that can be utilized in an analog-based network environment. In other words, by using the genie, hardware or software separated from each other can recognize each other through a network, and mutual data communication is possible.

In addition, since Genie can utilize peripheral devices regardless of operating system (OS), it has the advantage of reducing the data connection load generated when data is controlled by a single operating system to strengthen the distributed environment among network devices.

However, the time alignment of the clock embedded in the PDA terminal is not only inconvenient because the user has to set it manually, but also does not set the correct standard time.

On the other hand, the time synchronization protocol between computers is based on the Simple Network Time Protocol (SNTP). When the time information client computer sends a packet to the time information server computer providing the standard time by using SNTP, the time information server computer A packet containing standard time information is sent in a format suitable for the SNTP protocol. That is, the Internet has a number of time information servers that provide standard time information, so that other computers connected to the Internet receive standard time information from time information servers using SNTP.

However, when a computer connected to a LAN but not to the Internet, that is, a computer that cannot connect to an external network, cannot receive standard time information provided by a time information server, synchronization to the standard time is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a PDA terminal or a computer which cannot be externally connected to service a time information of a time information server by providing a genie to the PDA terminal with accurate standard time information. The present invention provides a time information service method using genies that can synchronize the time of a computer system.

According to an aspect of the present invention, there is provided a time information service providing system to a personal digital assistant (PDA) or a personal computer equipped with a Java application (Jini). Is a first and second time information server for transmitting time information by SNTP packet communication, and a lookup server storing service information of the first and second time information servers and matching with the PDA or the PC. The method of providing a time information service to the PDA or the PC includes: a lookup server searching step of searching for the lookup server when a network connection for receiving the time information service is made; A lookup server service type determination step of determining a type of a service provided by the lookup server when the lookup server is found; A time information service request step of requesting a time information service if the lookup server service type is a time information service; A proxy transmission step of transmitting a proxy of a time information server for the requested time information service; A time information server call and time information request step of calling the time information server through the lookup server and requesting time information using the proxy; And synchronizing the system time of the PDA terminal or the PC by the time information transmitted from the time information server.

1 is a hardware configuration diagram for performing a time information service providing method using a genie according to an embodiment of the present invention,

2 is a flowchart illustrating a method of providing a time information service using a genie according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: time information server

110: lookup server

120: PDA terminal

130: personal computer

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

1 is a block diagram showing the configuration of a PDA terminal and a time information service providing apparatus to a PC according to a preferred embodiment of the present invention. The time information server 100, the lookup server 110, and the PDA terminal 120 are shown in FIG. , PC 130, each of which must be executable by Genie.

At this time, the time information server 100 is composed of a first time information server 102 and the second time information server 104, the first time information server 102 of the PC 130 is not possible to connect externally The second time information server 104 provides standard time information of the PDA terminal 120, and is provided between the first time information server 102 and the second time information server 104. Those skilled in the art will appreciate that providing standard time information by sending and receiving SNTP packets.

In addition, the time information service contents of the first and second time information servers 102 and 104 may be registered in the lookup server 110 so that the lookup server 110 may recognize service content information of the time information servers 100. Make sure That is, the lookup server 110 performs a matching function with the PDA terminal 120 and the PC 130, and stores information on the availability of time information service from time information servers.

The PDA terminal 120 or the PC 130 connects to the lookup server 110 through the network to request time information, and then receives and displays time information provided through the lookup server 110. The PDA terminal 120 and the lookup server 110 and the PC 130 and the lookup server 110 communicate using a unicast or multicast request protocol, and the lookup server 110. The PDA terminal 120 and the PC 130, which can be connected to the same time, can be connected to more than one.

2 is a flowchart illustrating a method for providing a time information service according to a preferred embodiment of the present invention, which will be described in detail with reference to the block diagram shown in FIG. 1.

At this time, the PDA terminal 120 and the PC 130 are equipped with Genie, and the time information service requested by the PDA terminal 120 is performed as follows.

A user connects to the network using a modem provided in the PDA terminal 120 to synchronize the time of the system according to the time information provided by the time information server (step 201), and then a lookup server for receiving time information service. (Step 202).

That is, the PDA terminal 120 first searches for a lookup server that provides a lookup service using a unicast or multicast request protocol. At this time, the lookup server 110 responds to the request signal (protocol) to its presence. To notify the PDA terminal 120.

The PDA terminal 120 that finds the lookup server 110 through this process reads the service type provided from the lookup server 110 (step 203), and transmits the service corresponding to the read service type to the lookup server 110. You will be asked.

That is, when the service type provided by the lookup server 110 is a time information service and a request for a time information service is received from the user (step 204), the PDA terminal 120 requests the time information service from the lookup server 110. (Step 205).

When the lookup server 110 receives the time information service request from the PDA terminal 120, the lookup server 110 provides the PDA terminal 120 with a proxy for the time information server 104 registered thereto (step 206). The PDA terminal 120 calls the second time information server 104 through the lookup server 110 again using the proxy provided by the lookup server 110, and then times the call to the second time information server 104. Information transfer is requested (step 207).

At this time, the second time information server 104 retrieves time information in response to a request of the PDA terminal 120 and transmits the retrieved information to the PDA terminal 120 through the lookup server 110 (step 208). The PDA terminal 120 synchronizes the time of the system according to the transmitted time information.

On the other hand, when the genie is capable of searching the lookup server 110 from the PC 130 capable of executing a request for the time information service to the searched lookup server 110, the lookup server 110 registers the time information server 104. Provides a proxy for the PC 130, and the PC 130 calls the second time information server 104 through the lookup server 110 again by using the proxy provided by the lookup server 110. Requires the transmission of

The second time information server 104 transmits and receives an SNTP packet to the first time information server 102, which is an external time information server providing external standard time information, and thereby receives the standard time from the first time information server 102. You will receive the information. The second time information server 104 receiving the standard time information transmits the standard time information to the PC 130, and the PC 103 synchronizes the time of the system according to the transmitted time information.

As described above, in the method for providing time information service according to the present invention, a PDA terminal or an external connection is provided by receiving time information service using a Genie on a PDA or PC equipped with a Java Virtual Machine (JVM). This impossible PC has the effect of synchronizing the system's time with accurate time information.

In the present invention, it is limited to synchronizing the time by receiving the correct time information by mounting a Java application (Jini) to a PDA or a PC, but the Java application (Jini) is mounted It will be readily understood by those skilled in the art that any system can synchronize the time provided with accurate time information at any time.

Claims (2)

In a method for providing time information service to a PDA (Personal Digital Assistant) or a PC equipped with a Java application (Jini), The time information service providing system, First and second time information servers for transmitting time information by SNTP packet communication; A lookup server storing service information of the first and second time information servers and serving as a match with the PDA or the PC; The time information service providing method to the PDA or the PC, A lookup server searching step of searching for the lookup server when a network connection for receiving the time information service is made; A lookup server service type determination step of determining a type of a service provided by the lookup server when the lookup server is found; A time information service request step of requesting a time information service if the lookup server service type is a time information service; A proxy transmission step of transmitting a proxy of a time information server for the requested time information service; A time information server call and time information request step of calling the time information server through the lookup server and requesting time information using the proxy; And a time synchronization step of synchronizing the system time of the PDA terminal or the PC by the time information transmitted from the time information server. The time information transmission in the time information server, If the time information service request from the PDA terminal, it is time information transmitted from the first time information server, And a time information service request from the PC, wherein the first time information server provides standard time information of a second time information server transmitted by the SNTP packet communication.