KR100732164B1 - Method for searching of full channel network in mobile terminal - Google Patents

Abstract

A method for searching a full channel network in a mobile communication terminal is provided to be capable of searching a new access network without using terminal information if a serviceable network is not found owing to deficiency of PRL(Preferred Roaming List) information or PLMN(Public Land Mobile Network) information of the terminal or in case of foreign roaming. A mobile communication terminal searches a serviceable system in a roaming area(S100), and transmits an access request signal which includes terminal information. If a response message for the request is not received(S101), the terminal scans full channels to perform a network searching process(S102). The terminal writes a network candidate system list by using information obtained through the searching process(S103). If an accept message is transmitted from a network, the terminal conducts network registration with the network(S106).

Description

Method for searching full channel network of mobile communication terminal

1 is a flowchart illustrating a full channel network searching method of a mobile communication terminal according to the present invention.

2 is a flowchart illustrating a process of registering a network list during network registration according to an embodiment of the present invention.

3 is a flowchart illustrating a terminal registration process after receiving an overhead message according to another embodiment of the present invention.

4 is a flowchart illustrating a process of performing network registration with priority of a network list according to the present invention.

The present invention relates to a mobile communication terminal, and more particularly, to a network search method of a mobile communication terminal in a roaming area.

The network search method of a mobile communication terminal according to the prior art is defined in the network selection method using PRL (Preferred Roaming List) based on the IS-683 spec. Used in CDMA and the spec. Such as 23.122 used in GSM / WCDMA. There is a public land mobile network (PLMN) selection method.
The network search method using the PRL is a method in which a terminal acquires a system and selects a network by a PRL predefined by an operator. The PRL describes channel information necessary for the terminal to acquire a system, SID (System ID) / NID (Network ID), home / roaming system, etc. for selecting a network.
The GSM / WCDMA uses a PLMN selection method. That is, the acquisition of the system scans all channels, and the network selection is performed in the order of registered public land mobile network (RPLMN), home public land mobile network (HPLMN), user controlled PLMN, etc. according to the PLMN selection procedure. do.
In other similar technologies, the patent application 10-2004-0065860, 'PLMN selection method of mobile communication terminal and mobile communication terminal' stores roamable PLMN table in the terminal and selects the system from roaming PLMN when it is not Home PLMN. The stored roaming PLMN tables can be downloaded from the network.
In addition, the patent application 10-2005-0066286 'apparatus and method for selecting an access network of the next generation mobile communication system' transmits the information of the access network around the network for 4G to the terminal to select the terminal according to the type of service or billing. do.
Among the conventional methods, there are advantages and disadvantages in the case of GSM / WCDMA system based on PLMN selection procedure and system search of PDMA based CDMA terminal.
Since the CDMA searches only the channels defined in the PRL, the system cannot be found unless the roaming area information is stored in the PRL.
On the other hand, in the case of GSM / WCDMA, it takes longer than CDMA because the entire channel is searched, but even if there is a new system in the roaming area, the system cannot be found.
However, in the case of a system stored as a system stored as a forbidden PLMN, the terminal may recognize that service for a predetermined time or more is impossible even though the terminal may service the system.
In the case of the patent 10-2004-0065860, the Roam PLMN list should be stored in the terminal, and if the roaming contract between the system or the provider is changed, the Roam PLMN list should be changed like the PRL of CDMA.
In addition, the patent 10-2005-006628 is proposed for the 4G system, the concept of the access network is determined based on the access network in one provider rather than the relationship between the other providers. In order to extend this concept, there is a problem in that it is necessary to acquire a peripheral access network between other providers.

An object of the present invention is to provide a method for finding a serviceable network when a terminal does not find a serviceable network in a mobile between overseas and domestic.
It also aims to find a serviceable network when a network is updated and a new network is added or network information is changed.

According to an aspect of the present invention, there is provided a method for searching a full channel network of a mobile communication terminal, the method comprising: searching for a serviceable network by scanning all channels, and selecting a candidate from among the searched networks. And storing at least one message of an accept or reject message by performing a network registration procedure of the network and the terminal from the candidate system list.
In addition, another feature of the full-channel network search method of the mobile communication terminal according to the present invention for achieving the above object, the step of performing a network registration of the searched (searched) network and the terminal through the full channel search (search) And receiving a control channel information message if there is no response message for performing network registration from the network, and re-registering network registration of a new network and a terminal based on the control channel information message.
More preferably, the full channel network searching is performed when a serviceable system acquisition fails when roaming the terminal.
More preferably, searching for the network synchronizes the signal of the terminal and the base station signal of the network.
More preferably, when the network is a code division multiple access (CDMA) system, the searching step obtains base station identifier (SID) / network identifier (NID) information of the system.
More preferably, when the network is a mobile communications globalization system (GSM) / wideband code division multiple access (WCDMA) system, the searching step obtains information of the system in a signaling message.
More preferably, the method may further include searching a network of a home system from the candidate system list.
More preferably, the method may further include searching a system network of a country or region such as a home system in the candidate system list.
More preferably, the method further comprises searching for a network of a system having a large transmission signal in the candidate system list.
More preferably, the control channel information message is an overhead message.
More preferably, the control channel information message is a broadcast control channel (BCCH) message, characterized in that the mobile communication terminal all channel network search method.
Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described by at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

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1 is a flowchart illustrating a full channel network searching method of a mobile communication terminal according to the present invention.

The mobile communication terminal searches for a serviceable system in the roaming area (S100). At this time, the mobile communication terminal transmits an access request signal including the terminal information through a reverse common signaling channel (R-CSCH) to establish a call.
If a response message according to the request is not received from the communication network system (S101), the terminal scans all channels to perform network searching (S102). At this time, only the synchronization with the network is performed in order to reduce the detection time in changing the channel and confirming the existence of the network.
When performing the search, in case of code division multiple access (CDMA) system, base station identifier (SID) / network identifier (NID) information is obtained, and in case of mobile communication globalization system (GSM) / wideband code division multiple access (WCDMA) system Obtain system information through a signaling message.
The terminal creates a network candidate system list using the information obtained through the searching (S103) and requests network registration to each system. At this time, the network transmits a message of Accept or reject for terminal registration.
If the rejection message is transmitted from the network, the terminal indicates that the network service is not provided (S105).
However, if an accept message is transmitted from the network, the terminal performs network registration with the network (S106).

2 is a flowchart illustrating a process of registering a network list during network registration according to an embodiment of the present invention.

After performing all channel system searching in the terminal, network registration of the terminal is performed in the searched network (S200, 201).
Thereafter, when the terminal receives a RRC connection setup (Radio Resource Control connection setup) message from the network and a call session is made, the terminal stores the system in which the call session is made in an accepted network list (S203, S204).
On the other hand, if the terminal receives an RRC connection rejection (Resource Control connection reject) message from the network, and stores the system in the rejected network list (S205).

3 is a flowchart illustrating a terminal registration process after receiving an overhead message according to another embodiment of the present invention.

The network registration of the terminal according to the present invention is performed before receiving an overhead message or a broadcast control channel message from a network base station in order to reduce the time of full channel network searching. The terminal scans all channels and performs network registration with the serviceable network (S300). A network list process is performed by receiving a Radio Resource Control (RRC) connection accept message or reject message from a network that attempts to register a network (S301 and 304). When there is no response to the accept or reject message, an overhead message / broadcast control channel (BCCH) message is received from the base station of the cell where the terminal is located (S302). The terminal network registration is re-executed through the message (S303).

4 is a flowchart illustrating a process of performing network registration with a priority of a network list according to the present invention.

The terminal scans all channels to create a serviceable network list. At this time, the terminal determines whether the home system exists from the accepted network list (S400). If the home system does not exist, it is determined whether a system of the same country or region exists as the home system (S401). When such a system does not exist in the network list, the system searches for a system having a large signal strength (S402). If none of the corresponding systems exists, the terminal sets an arbitrary system as a network for network registration service (S403). The terminal and the network network registration with each selected system is performed (S404). The network registration is canceled with respect to the system of the unselected network list (S405). A terminal call session with the selected system is established and a service is used (S406).
Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

As described above, the present invention has the effect of finding a new access network without using terminal information when roaming abroad or when a service network cannot be found due to lack of terminal internal PRL information or PLMN information.

Claims (11)

Searching the serviceable network by scanning all channels; Storing a list of candidate systems in the searched network; And receiving at least one of an accept or reject message by performing a network registration procedure of the network and the terminal from the candidate system list. Claim 2 was abandoned when the setup registration fee was paid. The method of claim 1, All channel network searching method of the mobile communication terminal characterized in that performing the full channel network search (searching) when the acquisition of a serviceable system when roaming the terminal fails. Claim 3 was abandoned when the setup registration fee was paid. The method of claim 1, The searching of the network may include synchronizing a signal of the terminal and a signal of a base station of the network. Claim 4 was abandoned when the registration fee was paid. The method of claim 1, If the network is a code division multiple access (CDMA) system, the searching step includes obtaining base station identifier (SID) / network identifier (NID) information of the system. How to search for a network. Claim 5 was abandoned upon payment of a set-up fee. The method of claim 1, If the network is a mobile communication globalization system (GSM) / Wideband Code Division Multiple Access (WCDMA) system, the searching step comprises: obtaining information of the system from a signaling message; Full channel network search method of communication terminal. Claim 6 was abandoned when the registration fee was paid. The method of claim 1, And searching for a network of a home system from the candidate system list. Claim 7 was abandoned upon payment of a set-up fee. The method of claim 1, And searching for a system network of a country or region, such as a home system, in the candidate system list. Claim 8 was abandoned when the registration fee was paid. The method of claim 1, And searching for a network of a system having a large transmission signal in the candidate system list. Performing network registration of the searched network and the terminal through all channel searching; Receiving a control channel information message if there is no response message for performing network registration from the network; And And re-registering the network of the new network and the terminal based on the control channel information message. Claim 10 was abandoned upon payment of a setup registration fee. The method of claim 9, And the control channel information message is an overhead message. Claim 11 was abandoned upon payment of a setup registration fee. The method of claim 9, And the control channel information message is a broadcast control channel (BCCH) message.

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