KR20220090061A - Network system using mobile network - Google Patents

Abstract

In the present invention, a position determination server (PDE: Position Determination Entity) side in an AGPS system in a wireless LAN environment
AGPS provides AGPS data and NTP (Network Time Protocol) server provides synchronized time information.
Disclosed is a method of measuring a location of a terminal using data and time information. As such, based on a GPS positioning device,
By utilizing the AGPS (Assisted GPS) concept in a system that measures the location of a terminal user and provides a service based on it,
Increase the initial location search time the user waits until the location sun comes out from the GPS receiver to obtain the user's initial location.
It is possible to reduce the number of problems and to measure the location of the terminal quickly and accurately.

Description

Network system using mobile network

The present invention relates to an AGPS (Assisted Global Positioning System) system, particularly in a wireless LAN environment, synchronized with the system.

AGPS system using NTP (Network Time Protocol) server to provide time information and terminal using the same

It relates to a method of measuring the position of

Recently, in order to provide communication services such as the Internet that transcend space, many companies are trying to develop a new technology called wireless Internet.

is accelerating In accordance with this trend, a wireless LAN network that enables wireless Internet has been built.

A LAN network is a local area network (LAN) that generally uses radio waves or infrared transmission methods.

It refers to the technology to establish a network between computers and electronic equipment using radio waves instead of cables such as wires. In this way, visible

Because it uses radio waves that do not exist in the wireless LAN network, not only can the construction time and cost be greatly reduced, but also the

It is possible to access the network while moving freely in the

make it The development of mobile communication terminal-related technology and the rapid increase in the penetration rate of mobile communication terminals have resulted in the development of this wireless LAN environment.

further promoted

For example, a user can use a PDA or a laptop computer within a certain distance from the place where an access point (AP) is installed.

You can use services such as the Internet by connecting to a wireless LAN network through the However, since these services use radio frequencies,

There is no need for a local phone line or a dedicated line, but a wireless LAN card is required to use these services on a PDA or laptop computer.

must be good

In general, the WLAN network as described above is constructed as shown in FIG. 1 . General system using wireless LAN technology

Referring to FIG. 1 to review the network configuration and transmission procedure. As shown in FIG. 1, the wireless LAN network enables wireless Internet communication.

It is composed of a terminal 100 , an access point 110 , and a network 120 . First, devices such as PDA and NotePC

The terminal 100 is equipped with a wireless LAN card to use various wireless Internet services, thereby enabling wireless LAN access. that

The high-speed access device 110 is a repeater that enables wireless Internet service to be used, and each terminal equipped with a wireless LAN function is connected to the

It is possible to use services such as the Internet through the device 110 . At this time, the communication between the terminal 100 and the connection device 110 is infrared,

frequency is used.

On the other hand, among various wireless Internet services using terminals such as mobile phones and PDA's, location-based services are widely used.

It has been in the spotlight for its convenience and convenience. These wireless Internet services provide traffic information and vehicle navigation according to the location of the terminal.

It can be used in various fields and situations, such as In order to use these wireless Internet services, it is necessary to determine the location of the terminal.

Alcohol use is essential. Currently, GPS (Global Positioning System) is used as a method of determining a location using wireless communication.

How to do it is an example.

In general, GPS satellites are used to

In general, when there is no information such as user location and time information, GPS is used for the terminal to calculate its own location.

In order to acquire a signal, it is necessary to sequentially search a search space consisting of frequencies and codes for all satellites. By the way

Using the AGPS method, the user's location and time information can be roughly known.

Since the number of visible satellites and the Doppler shift value can be predicted, the number of satellites to be searched can be reduced.

Liver becomes faster In addition, even if there is no user's location and current time information, if the AGPS method is used, the currently operating satellite

Since the number of can be known, the number of satellites to be searched can be reduced.

On the other hand, the system and data of a wireless LAN environment that provides a service to measure the user's location using a GPS location measuring device

In order to transmit/receive, a method for obtaining synchronized accurate time information is required. If synchronized with the system as described above

If time information can be obtained, the user's location can be measured using AGPS data and time information through the network.

It is possible to improve the initial location search time (TTFF: Time To First Fix) and sensitivity (Sensitivity). However, the system and

Since there is no way to obtain the due time, there is a problem in that it is difficult to implement the AGPS system in a wireless LAN environment.

As described above, in the prior art, a terminal equipped with a wireless LAN function connects to a network network through an access device and then connects to the network.

AGPS data necessary for position calculation can be provided from the existing positioning server, whereas time information synchronized with the system is

Since it cannot be obtained, there is a problem in that it is difficult to implement the AGPS system in a wireless LAN environment.

Accordingly, the present invention provides synchronized time information using an NTP (Network Time Protocol) server in an AGPS system in a wireless LAN environment.

AGPS system using an NTP (Network Time Protocol) server that provides information to measure the location of a terminal

and to provide a method for measuring a position of a terminal using the same.

The present invention for achieving the above object uses a NTP (Network Time Protocol) server in a wireless LAN environment

In an AGPS (Assisted Global Positioning System) system, when a location-related service is requested, a wireless LAN function is used to

When an AGPS data request message and time information request message are transmitted, and AGPS data and time information corresponding thereto are received,

A terminal measuring its own location using the received AGPS data and time information, and a message received from the terminal

, and transmits the received message to the server according to the analysis result, and transmits the message received from the server.

An access point that transmits to the terminal, and a message received from the access device are an AGPS data request message

In the case of , a location determination server that generates AGPS data corresponding to the AGPS data request message and provides it to the access device.

(Position Determination Entity) and when the message received from the access device is a time information request message, the time

It is specially configured to include an NTP server that generates synchronized time information corresponding to the information request message and provides it to the access device.

do it with a jin

In addition, the present invention provides an AGPS (Assisted Network Time Protocol) server using an NTP (Network Time Protocol) server in a wireless LAN environment.

In the method for measuring the location of a terminal in a Global Positioning System) system, when the terminal requests a location-related service

The process of generating and transmitting an AGPS data request message and a time information request message, and an access chapter in response to the message transmission

chi analyzes the message received from the terminal, and according to the analysis result, any one of the positioning server and the NTP server

transmitting the message, and the access device transmits a response message received from each server to the terminal

and the access field corresponding to the terminal sending the AGPS data request message and the time information request message

It characterized in that it includes the process of measuring its own location using a response message received from the device.

NTP is used to synchronize clock times between network elements (NEs) connected to the network.

is the protocol. NTP is currently used as an Internet standard, and synchronization technology and

Considering the traffic, it is possible to provide time information having an accuracy of 1 to 50 ms. Specifically, the time server (Time

A terminal that is equipped with a receiver only on a network component designated as Server), that is, an NTP server, and is connected to this server through a network

By performing synchronization using a protocol such as NTP for the clock time of

can be eliminated

The configuration of the NTP is configured as shown in FIG. 2 . Referring to FIG. 2, the configuration of NTP will be schematically looked at.

If NTP is used by either the client or the server, it is necessary to distinguish between NTP server and NTP client according to the user.

A field called MODE is implemented.

This NTP configuration is a root delay that points to the total round delay to the NTP server that is referred to in priority.

(Root Delay), the root variance that points to the normal error associated with the NTP server that is preferentially referenced.

Dispersion, a reference time that records the time the local clock was last set or corrected

Timestamp), the original time to record the time the request from the client to the server was sent (Original Timestamp), said

Receive Timestamp, which records the time the request arrived at the server, and the time at which the response was sent from the server to the client.

It consists of a transmit timestamp to be recorded. Based on the above, NTP is not only about time information, but also about delay factors.

This is because the NTP client and NTP server record and deliver time information for each state.

The delay time can be inferred from the propagation time using one factor.

If such an NTP and time server are used, synchronized time information such as a system that connects to a network network using a wireless LAN environment is stored.

It becomes possible to obtain synchronized accurate time information even in systems that cannot be obtained.

The configuration of the NTP is configured as shown in FIG. 2 . Referring to FIG. 2, the configuration of NTP will be schematically looked at.

If NTP is used by either the client or the server, it is necessary to distinguish between NTP server and NTP client according to the user.

A field called MODE is implemented.

This NTP configuration is a root delay that points to the total round delay to the NTP server that is referred to in priority.

(Root Delay), the root variance that points to the normal error associated with the NTP server that is preferentially referenced.

Dispersion, a reference time that records the time the local clock was last set or corrected

Timestamp), the original time to record the time the request from the client to the server was sent (Original Timestamp), said

Receive Timestamp, which records the time the request arrived at the server, and the time at which the response was sent from the server to the client.

It consists of a transmit timestamp to be recorded. Based on the above, NTP is not only about time information, but also about delay factors.

This is because the NTP client and NTP server record and deliver time information for each state.

The delay time can be inferred from the propagation time using one factor.

If such an NTP and time server are used, synchronized time information such as a system that connects to a network network using a wireless LAN environment is stored.

It becomes possible to obtain synchronized accurate time information even in systems that cannot be obtained.

3 is a block diagram of an AGPS system using an NTP server in a wireless LAN environment according to an embodiment of the present invention. 3 below

With reference, the AGPS system using an NTP server according to an embodiment of the present invention will be described in detail.

Referring to FIG. 3 , the AGPS system according to an embodiment of the present invention includes a terminal 200 , an access point (AP) 210 , and an NTP server.

220 and a network network 240 including a location determination server 230 .

Claims (1)

According to the present invention described above, the location of the terminal user is measured based on the GPS location measuring device and a service based thereon is provided.
By utilizing the Assisted GPS (GPS) concept in a system that
It can greatly reduce the initial location search time that users wait until the solution comes out, and it can be used in GPS shadow areas while driving in the city.
Problems that may occur because the time GPS location solution does not appear, for example, route deviation, map matching errors, etc.
There are advantages to reducing
In addition, according to the present invention, in the case of a terminal accessing a network network through a wireless LAN function, an accurate time synchronized with the network network
By using an NTP server in a system where information cannot be obtained, time information synchronized with that system can be obtained. Therefore, NTP
If a server is used, the AGPS system can be implemented only with the wireless LAN function, and various advantages of the wireless LAN can be efficiently utilized.
There are advantages to using it.