KR20050105024A - Method for cell reselection of dual mode mobile terminal - Google Patents

Abstract

The present invention relates to a cell reselection method of a dual mode mobile terminal, wherein a dual mode mobile is performed in a situation where a second generation (2G) and a third generation (3G) network exist simultaneously. When using a mobile communication service as a terminal, there is a problem that a network selection method for efficient service operation is insufficient. In consideration of such a problem, the present invention is configured to enable cell reselection to a 2G network or a 3G network in order to change a previously registered network according to a service to be used when using a dual mode mobile terminal. Therefore, it solves the problem of excessive access of 3G network caused by the dual mode mobile terminal which performs 2G mobile communication service and accesses the 3G network, and if it is registered in the 2G network but wants to use the 3G mobile communication service, By connecting to a network, the network can be used efficiently.

Description

Cell reselection method of dual-mode mobile terminal {METHOD FOR CELL RESELECTION OF DUAL MODE MOBILE TERMINAL}

The present invention relates to a cell reselection method of a dual mode mobile terminal in a RADIO ACCESS TECHNOLOGY (RAT), and more particularly, to a second generation (2G) network and a third generation ( 3'rd Generation: 3G) Cell reselection of dual mode mobile terminal to properly use two networks when receiving mobile communication service using dual mode mobile terminal in the situation where network exists simultaneously It is about a method.

In the current mobile communication system, GSM (Global System for Mobile communication), which is classified as a 2G mobile communication system, is widely used in Europe and other regions, and UMTS (3G) of 3G mobile communication system for providing high quality voice and multimedia services is provided. The use of Universal Mobile Telecommunication System is gradually increasing.

Mobile technology will evolve from GSM, which is a 2G mobile communication system, to UMTS, which is a 3G mobile communication system, but the transition from 2G mobile communication systems to 3G mobile communication systems will take place gradually over the course of several years. . As a result, network operators have felt the need to provide users with mobile terminals that can operate in both technologies, GSM and UMTS. Before UMTS was fully implemented, users could use a dual-mode mobile terminal that supports both GSM and UMTS simultaneously to provide multi-RAT services that could be converted to currently available technologies such as GSM 900 or GSM 1800 even in areas where UMTS is not available. Can be provided.

However, when there are two networks for using GSM, which is a 2G mobile communication system, and UMTS, which is a 3G mobile communication system, there is a problem in which network to use when receiving a service using a dual mode mobile terminal. Several methods have been suggested. Currently, only a method in which a dual mode mobile terminal registers in a cell having a strong reception strength in the initial cell selection stage or manually registers in a network desired by a user is used.

However, in the prior art as described above, only a method of registering in a cell having good reception strength or registering in a 2G or 3G network according to a user's selection has insufficient problem in selecting a network for proper resource distribution.

In addition, when a large number of users want to use a 3G network to use two-way video telephony (VT) with UMTS, a 3G mobile communication system, even if a 2G network is used, a voice call user without a problem uses the 3G network. For this reason, there is a problem that may occur when the service cannot be supported.

Accordingly, the present invention has been made in view of the above problems, and the dual mode for appropriately utilizing 2G and 3G networks by performing cell reselection of a dual mode mobile terminal registered in a specific network according to a service desired by a user. An object of the present invention is to provide a cell reselection method of a mobile terminal.

The present invention for achieving the above object, when the first dual-mode mobile terminal and the second dual-mode mobile terminal registered in the second generation network attempts to perform the third generation mobile communication service, the first dual mode Registering by the mobile terminal with the third generation network by cell reselection; requesting, by the first dual mode mobile terminal, to use the third generation mobile communication service; and receiving, by the second dual mode mobile terminal, the request. Registering to the third generation network by cell reselection if received, and performing the third generation mobile communication service in response to the request for using the third generation mobile communication service by the second dual mode mobile terminal. It is done.

Further, when the first dual mode mobile terminal and the second dual mode mobile terminal registered in the third generation network attempt to perform the second generation mobile communication service, the first dual mode mobile terminal selects the second by the cell reselection. Registering with a generation network, requesting the first dual-mode mobile terminal to use a second generation mobile communication service, and regenerating the second generation by cell reselection when the second dual-mode mobile terminal receives the request. Registering with a network; and performing a second generation mobile communication service in response to the second generation mobile communication service use request by the second dual mode mobile terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a ladder diagram illustrating a method for cell reselection when a dual mode mobile terminal registered in a 2G network attempts a two-way video call. As shown in FIG. 1, a first dual mode mobile terminal and a second dual mode mobile terminal may be used. When the first dual mode mobile terminal attempts a two-way video call (VT) in a state registered in the 2G network (S101, S102) (S103), it requests the 2G base station to reselect the cell of the 3G network (S104). If the cell reselection of the 3G network is approved (S105), the first dual mode mobile terminal is registered (S106) with the 3G network. At this time, when the first dual mode mobile terminal registered in the 3G network requests the VT service to the 3G base station (S107), it notifies the 2G base station (S108), and again requests the use of the VT service from the 2G base station to the second dual mode mobile terminal. Inform the fact (S109). If the second dual mode mobile terminal receives the VT service request of the first dual mode mobile terminal and wants to use the service, it requests the cell reselection of the 3G network to the 2G base station (S110) and approves the cell reselection accordingly ( S111) If received, it is registered in the 3G network (S112). In this state, when the 3G base station requests the use of the VT service to the second dual mode mobile terminal (S113), it transmits a response to use it to the 3G base station (S114) to establish a connection between the first dual mode mobile terminal and the second dual mode mobile terminal. VT service is done.

That is, in the case of the two-way video call service in which the service is available only when both dual-mode mobile terminals are connected to the 3G network, if one or both are connected to the 2G network, the service usage may be reduced through cell reselection of the 3G network. Make it possible.

However, if the 3G network cell reselection is not approved by the first dual mode mobile terminal (not shown), the 2G base station transmits the fact that the approval is not transmitted to the first dual mode mobile terminal and uses voice call service. If the first dual mode mobile terminal desires a voice call service, the second dual mode mobile terminal may use a voice call service between the second dual mode mobile terminals in response to the request.

In addition, when the second dual mode mobile terminal does not receive approval for accessing the 3G network from the 2G base station (not shown), the second dual mode mobile terminal transmits the unapproved fact to the first dual mode mobile terminal registered in the 3G network, Connect to 2G network and ask if you want to use voice call service. At this time, when the first dual-mode mobile terminal desires a voice call, the 3G base station requests the cell reselection of the 2G network to receive the 2G network cell reselection. Accordingly, if the first dual mode mobile terminal requests a 2G mobile communication service, a voice call service using a 2G network may be used between both users.

Although FIG. 1 illustrates an interactive video call as an example of a 3G mobile communication service, cell reselection is performed in the same manner as shown in the case of a streaming video on demand, a multimedia message service, and a wireless e-commerce service. .

FIG. 2 is a ladder diagram illustrating a cell reselection method when a dual mode mobile terminal registered in a 3G network attempts a voice call. As shown in FIG. 2, a first dual mode mobile terminal is registered in a 3G network (S201). When the first dual mode mobile terminal attempts a voice call corresponding to a 2G mobile communication service in a state in which the second dual mode mobile terminal is registered in the 2G network (S202), the 3G base station in the first dual mode mobile terminal Request cell reselection of the 2G network (S204), and accordingly receive an approval (S205) is registered in the 2G network (S206). At this time, when the first dual mode mobile terminal requests to use the voice call service to the 2G base station (S207), the 2G base station transfers it to the second dual mode mobile terminal (S208), and the request requests the second dual mode mobile terminal. If the answer is S209, voice call service of both dual mode mobile terminal periods is available.

Here, the 2G mobile communication service shows a case of a voice call, but the message transmission service corresponds to this, and cell reselection is performed in the same manner.

As described in detail above, the present invention has an effect that the network can be efficiently used according to the desired service when using the mobile communication service as a dual-mode mobile terminal in the presence of 2G network and 3G network at the same time.

In particular, by connecting the dual mode mobile terminal registered in the 3G network to the 2G network according to the service to be used, the user who uses only the voice call solves the problem that the 3G mobile communication service cannot be used because the 3G network is used. Although registered, but intends to use the 3G mobile communication service, there is an effect of properly distributing resources according to the network through cell reselection of the 3G network.

1 is a ladder diagram of a cell reselection method when a dual mode mobile terminal registered in a 2G network attempts a two-way video call.

FIG. 2 is a ladder diagram illustrating a cell reselection method when a dual mode mobile terminal registered in a 3G network attempts a voice call. FIG.

Claims (8)

When the first dual mode mobile terminal and the second dual mode mobile terminal registered in the second generation network attempt to perform the third generation mobile communication service, the first dual mode mobile terminal selects the third generation network by cell reselection. Registering with, Requesting, by the first dual mode mobile terminal, to use a third generation mobile communication service; Registering with the third generation network by cell reselection when the second dual mode mobile terminal receives the request; And performing, by the second dual mode mobile terminal, a third generation mobile communication service in response to the request. The method of claim 1, The cell reselection process of the first dual mode mobile terminal, Requesting cell reselection of a third generation network from a first dual mode mobile terminal to a second generation base station; Approving a cell reselection of a third generation network from the second generation base station to the first dual mode mobile terminal. The method of claim 1, The cell reselection process of the second dual mode mobile terminal, Requesting cell reselection of a third generation network from a second dual mode mobile terminal to a second generation base station; Approving a cell reselection of a third generation network from the second generation base station to the second dual mode mobile station. The method of claim 1, The third generation mobile communication service is a cell reselection method of a dual mode mobile terminal, characterized in that consisting of two-way video call, video on demand service or wireless e-commerce services. When the first dual mode mobile terminal and the second dual mode mobile terminal registered in the third generation network attempt to perform the second generation mobile communication service, the first dual mode mobile terminal selects the second generation network by cell reselection. Registering with, Requesting, by the first dual mode mobile terminal, to use a second generation mobile communication service; Registering with the second generation network by cell reselection when the second dual mode mobile terminal receives the request; And performing, by the second dual mode mobile terminal, a second generation mobile communication service in response to the request. The method of claim 5, The cell reselection process of the first dual mode mobile terminal, Requesting cell reselection of a second generation network from a first dual mode mobile terminal to a third generation base station; And approving cell reselection of a second generation network from the third generation base station to the first dual mode mobile terminal. The method of claim 5, The cell reselection process of the second dual mode mobile terminal, Requesting cell reselection of a second generation network from a second dual mode mobile terminal to a third generation base station; And acknowledging a cell reselection of a second generation network by the third generation base station to the second dual mode mobile terminal. The method of claim 5, The second generation mobile communication service cell reselection method of a dual mode mobile terminal, characterized in that consisting of a voice call service or a short message service.