KR20040088660A - Roaming method of dual mode terminal using location information - Google Patents

Abstract

PURPOSE: A roaming method of a dual mode terminal by using position information is provided to measure a position of a current terminal, and to prevent the terminal from roaming to a 2G network if the measured position is in a 3G network service area, to suppress an unnecessary driving of a 2G network modem, thereby reducing power consumption. CONSTITUTION: A system measures a current position of a dual mode terminal by using a base station. The base station decides whether the position of the dual mode terminal is in a 3G network service area, and supplies the decided results to the dual mode terminal. If the terminal is located in the service area, the dual mode terminal does not roam to a 2G network. When deciding whether the position of the dual mode terminal is in the 3G network service area, the base station compares the position of the dual mode terminal with self 3G network service area information, and confirms whether the dual mode terminal is located in the 3G network service area.

Description

ROAMING METHOD OF DUAL MODE TERMINAL USING LOCATION INFORMATION}

The present invention relates to a roaming method of a dual mode terminal using location information. In particular, the present invention relates to a dual mode (DDMA) system which simultaneously supports a CDMA (code division multiple access) system, which is a second generation network, and a WCDMA (Wideband Code Division Multiple Access) system, which is a third generation network. Mode) A method for roaming a dual mode terminal using location information suitable for reducing power consumption by preventing operation of a second generation network modem that may occur when the terminal detects a third generation network shadow area in a third generation network service area. will be.

The CDMA system currently in use is already extensively serviced and fully equipped with infrastructure. However, in order to provide services that cannot be supported in 2G networks such as CDMA systems, 3G networks such as WCDMA systems are gradually introduced. In the area where 3G networks are installed while using the infrastructure of these 2G networks, A dual mode terminal designed to receive specialized services of 3G network is being developed.

However, until now, 3G communication networks have been developed independently from 2G communication networks, and modems supporting both CDMA (CDMA) and WCDMA (3G) have not been developed, so each modem is used separately. In this case, roaming to each communication network requires frequent on and off of the CDMA modem.

There is no specific standard for roaming with 2nd generation networks. Therefore, there is no standard that defines the cases that can occur in switching the use of each network in a dual mode terminal applying a CDMA / WCDMA dual modem to use a second generation network and a third generation network at the same time.

Therefore, the types of errors that may occur when roaming to a communication network (3rd generation network) that supports and confirms a broadcasting signal provided by each communication network (2nd generation network) and a method of processing them are not standardized. Here, we discuss how to handle the situation that may occur when the dual mode terminal is located in the shadow area of the 3G network.

FIG. 1 is a conceptual diagram of roaming in an area in which general 2nd and 3rd generation network systems are installed, and as shown in FIG. 1, roaming in a test installation area of a 3rd generation network is shown. Dual-mode terminal supports 2G network and 3G network, so roaming into 3G network by broadcasting signal from 2G network when terminal enters the area where 3G network and 2G network are installed at the same time Will be implemented. That is, the 2nd generation network continuously transmits the 3rd generation network movement command to the dual mode terminal. Therefore, the dual mode terminal switches to the 3rd generation network by the command of the 2nd generation network system when the 3rd generation network is simultaneously installed. Will be implemented. This makes it possible to use unique services of the 3G network.

As shown in the drawing, the dual mode terminal entering the 3G network service area in the 2G network mode 10 using the 2G network modem receives the 3G network movement command from the standby state and turns on the 3G network modem. Start to search the 3G network. If the entry into the 3G network mode 20 is successful (ie, Receive Signal Strength Indication (RSSI) is greater than or equal to 0), the 3G network standby state is completed and roaming is completed. In this case, if RSSI value is continuously checked and its value becomes 0 (out of the 3G network service area), the RSSI timer is started.If the value is over the predetermined value, the 2G network modem is turned on again after the timer is exceeded. Roam to generation network mode 10.

FIG. 2 is a conceptual diagram illustrating a dual mode terminal 30 and a third generation network shadow area 50 located in a WCDMA service area 40 that is a third generation network.

As described above with reference to FIG. 1, when roaming to the second generation network using only the received signal strength (RSSI) of the third generation network in service, the dual mode terminal 30 selects the third generation network service area 40. It does not occur as a result of the departure, even if it is caused by simply entering the 3G network shadow area 50, the 2G network modem is turned on to perform roaming. Then, when the shaded area 50 is out of the roaming back to the third generation network, the frequent generation of on and off of the second generation network modem. This may cause excessive power consumption.

Accordingly, there is a need for a method for processing a 3G network shadow area in a 3G network service area that can reduce the on-off occurrence of the frequent 2G network modem described above, thereby reducing the power consumption of the mobile terminal.

As described above, when the dual-band dual mode terminal enters the shadow area from the 3G network service area, the 2G network is considered to be out of the 3G network service area due to the decrease in the 3G network reception signal strength and roams to the 2G network. Since the network modem is frequently driven, there is a serious problem of power consumption due to unnecessary generation of the second generation network modem.

In view of the above problems, the present invention measures the location of the current terminal to prevent roaming to the second generation network if the location is a third generation network service area to suppress unnecessary driving of the second generation network modem to reduce power consumption. An object of the present invention is to provide a roaming method of a dual mode terminal using one location information.

1 is a state diagram illustrating a roaming method between a second generation network and a third generation network.

2 is a conceptual diagram showing a 3G network service area including a shaded area.

Figure 3 is a flow chart of one embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: 2nd generation network mode 20: 3rd generation network mode

30: dual mode terminal 40: 3G network service area

50: 3rd generation network shadow area

The present invention for achieving the above object, in the roaming method of a dual mode terminal that can use the second generation and third generation network services and know their location, the current location of the dual mode terminal using a base station Measuring; Determining, by the base station, whether the location of the dual mode terminal is a 3G network service area and providing the result to the dual mode terminal; The dual mode terminal may not roam to the second generation network if the terminal is in the third generation network service area according to the result provided from the base station to the terminal.

When described in detail with reference to the accompanying drawings of an embodiment of the present invention as follows.

3 is a flow chart illustrating an embodiment of the present invention, a dual mode terminal used in the present invention includes a second generation network modem, a third generation network modem, and a global positioning system (GPS) for inter-mode roaming and terminal location information. Must be able to provide to the base station.

First, the current position of the dual mode terminal is measured using the base stations, and the position of the current dual mode terminal is shared by both the dual mode terminal and the neighboring base station.

By measuring the position of the dual mode terminal, it determines the movement of the dual mode terminal, and if not moved to the step of measuring the position of the dual mode terminal periodically.

When the dual mode terminal is moved by measuring the position of the dual mode terminal, it is determined whether the current dual mode terminal is located in the 3G network service area, which is the base station and the 3G network service area data owned by the base station. By comparing the result and informs the dual mode terminal.

If the location of the dual mode terminal is a third generation network service area through the location information transmitted from the base station, the operation of the second generation network modem is restricted by suppressing roaming to the second generation network.

As described above, if the dual mode terminal has a function of knowing its location, the base station sharing this information compares the location of the terminal with the 3G network service area and provides the dual mode terminal to the 3G network service. Roaming is enabled while blocking roaming to the second generation network. Blocking roaming to the 2nd generation network does not run the 2nd generation modem even when entering the 3rd generation network shaded area while the 3rd generation modem modem is being used. Will be.

As described above, the roaming method of a dual mode terminal using the present invention's location information measures the location of the current terminal and prevents roaming to the second generation network if the corresponding location is a third generation network service area, thereby driving unnecessary second generation network modems. By suppressing the power consumption of the terminal can be reduced.

Claims (2)

A roaming method of a dual mode terminal capable of using a second generation network and a third generation network service and knowing its location, the method comprising: measuring a current location of a dual mode terminal using a base station; Determining, by the base station, whether the location of the dual mode terminal is a 3G network service area and providing the result to the dual mode terminal; If the terminal is within the 3G network service area by the result provided from the base station to the terminal, the dual mode terminal comprising the step of not roaming to the 2G network, characterized in that the dual mode terminal using location information Roaming method. The method of claim 1, wherein the determining of whether the location of the dual mode terminal is a 3G network service area comprises: comparing the location of the dual mode terminal to the 3G network service area information already owned by the base station. Roaming method of a dual mode terminal using location information, characterized in that it further comprises the step of confirming whether the dual mode terminal in the third generation network service area.