KR100318954B1 - Apparatus for enhancing home public land mobile network and method thereof in mobile communication system - Google Patents

Abstract

The present invention relates to a mobile communication system, and more particularly, to an apparatus and method for extending a serving home mobile telephone network.

According to an aspect of the present invention, there is provided a base station and a mobile station connected to the base station to receive a mobile communication service, wherein the mobile communication system extends a location area through a specific channel from a base station roamed as the mobile station roams. Receiving information, checking whether the received location area information is registered in an equivalent class of a home mobile telephone network that is stored in advance, and if the result is registered in an equivalent class of a home mobile telephone network, the location area information The mobile telephone network corresponding to the home mobile telephone network is determined by the process of access.

Description

Home mobile telephone network expansion apparatus and method of mobile communication system {APPARATUS FOR ENHANCING HOME PUBLIC LAND MOBILE NETWORK AND METHOD THEREOF IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to a mobile communication system, and more particularly, to an apparatus and method for extending a serving home mobile telephone network.

The mobile communication system provides a wireless service to a plurality of mobile stations, and each of the plurality of mobile stations is serviced with priority in its Home Public Land Mobile Network (HPLMN). Thus, the mobile station attempts to search for the highest priority in its home mobile telephone network at the time of power on and roaming.

However, the mobile station loses the concept of the home mobile telephone network at the time of international roaming. That is, there is a problem that the mobile station does not recognize the home mobile telephone network when roaming from the first country to the second country, and the mobile station does not receive the same priority as in the home mobile phone network.

In addition, for a communication service provider, for example, a first service provider, a second service provider in a first country, a third service provider in a second country, and a fourth service provider provide communication services. Even when the first service provider of the first country and the third service provider of the second country are the same service provider, the concept of the home mobile telephone network is lost due to roaming between countries, so that the communication service provider also provides a service to the mobile station. There is a problem that it is impossible to perform, making it difficult to secure a large number of subscribers.

In addition, the additional service that can be provided only in the home mobile telephone network has a problem that the mobile station is not provided when the concept of the home mobile telephone network is lost.

Accordingly, an object of the present invention is to provide a method for extending a home mobile telephone network in a mobile communication system.

Another object of the present invention is to provide an apparatus for extending a home mobile telephone network in a mobile communication system.

The method of the present invention for achieving the above object; A method of extending a home mobile telephone network in a mobile communication system, comprising: a base station and a mobile station connected to the base station to receive a mobile communication service, wherein the location area information is received from a roamed base station through a specific channel as the mobile station roams; And checking whether the received location area information is registered in the equivalent class of the home mobile telephone network, which is stored in advance, and when the test result is registered in the equivalent class of the home mobile telephone network, The mobile telephone network is characterized in that the process consists of accessing the home mobile telephone network.

The apparatus of the present invention for achieving the above object; A home mobile telephone network extension device of a mobile communication system, comprising: a subscriber information storage unit for storing a country code for identifying a home mobile telephone network and each code constituting a network code in a home mobile telephone network equivalent class; And a control unit for retrieving location area information received through a channel, and determining the roamed mobile phone network as a home mobile phone network if the country code and network code of the location area information are equivalent to the stored home mobile phone network. Characterized in that configured.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically illustrates a configuration of a mobile communication system that performs a function in an embodiment of the present invention.

2 is a block diagram showing an internal configuration of a mobile station for performing a function in an embodiment of the present invention.

3 is a diagram illustrating a location area identifier provided by a mobile communication system.

4 is a flowchart illustrating a mobile phone network access process of a mobile station according to an embodiment of the present invention.

5 is a signal flow diagram illustrating in detail a process of determining a home mobile telephone network of a mobile station according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

1 is a diagram schematically showing a configuration of a mobile communication system that performs a function in an embodiment of the present invention.

The mobile communication system includes a switching center, that is, a mobile switching center (MSC) 130, a home location register (HLR) 140, a BTS controller (BSC) 120 and a base station (BTS). : Base Transceiver Subsystem (110), and connected wirelessly with a mobile station (MS) 100, the Public Switching Telecommunication Network (PSTN) 160 and the Mobile Phone Network (PLMN) Mobile Network (150). The base station controller 120 performs radio link, wired link control, and hand-off functions. The base station 110 forms a wireless communication path together with the mobile station 100 and manages radio resources. The home location register 140 performs a subscriber location registration function and stores subscriber identification and number planning related information, subscriber operation related information, authentication related information, additional service related information, and billing related information. In particular, one embodiment of the present invention stores Equivalence Class information for an extended home mobile telephone network. The mobile station 100 also stores equivalent class information for the extended home mobile telephone network in accordance with one embodiment of the present invention.

2 is a block diagram showing an internal configuration of a mobile station for performing a function in an embodiment of the present invention.

The controller 111 controls the overall operation of the mobile station. The memory 113 stores control programs generated according to the control program of the mobile station and the control of the control unit 111.

The key input unit 115 includes a plurality of dialing digit keys, a menu key, a send key, and the like, and generates and transmits a key signal corresponding to a key selected by a user to the controller 111.

The voice memory 117 stores a plurality of voice messages, and the voice processor 119 performs analog processing of voice messages read from the voice memory 117 under the control of the controller 111 and transmits them through a speaker. In addition, the digital signal processing analog voice input from the user through the microphone.

The transmitter 121 inputs the signal generated by the controller 111, digitally modulates the signal, and transmits the signal to the duplexer 123. The duplexer 123 transmits a radio signal received from the transmitter 121 through an antenna, and transmits a signal received through the antenna to the receiver 125. The receiver 125 demodulates a radio signal received from the duplexer 123 and transmits the demodulated signal to the controller 111, and the controller 111 controls a call according to the received signal.

The display unit 127 is implemented with a liquid crystal display unit (LCD), an LED, and the like, and displays control data and input data of the mobile station performed under the control of the controller 111.

The subscriber information storage unit 129 is a subscriber information module (SIM) card used in the Global System for Mobile (GSM) scheme and stores the mobile station subscriber information. In particular, one embodiment of the present invention stores Extended Home Mobile Telephone Network (HPLMN) Equivalence Class information.

The extended home mobile telephone network equivalent class information will be described in detail with reference to FIG. 3.

3 is a diagram illustrating a location area identifier provided by a mobile communication system.

The Location Area Identity (LAI) is provided by the mobile communication system, and as shown, a mobile country code (MCC) indicating a country where a mobile station is located, and a communication within a country where the mobile station is located. And a network code (MNC) indicating a mobile telephone network providing a service, and a location area code (LAC) indicating a region where the mobile station is located in the mobile telephone network.

The country code consists of a specific number, for example four digits, that is, up to country code digit 1 to the country code digit 4, and the network code consists of a specific number, for example two digits, that is, network digit 1 and network digit 2. The location area code is also composed of a specific number, for example, two location area codes 1 and location area codes 2.

When the mobile station receives the location area identifier configured as described above, the mobile station searches for a home mobile telephone network to be accessed by the mobile station with the country code and network code.

Therefore, in one embodiment of the present invention, the country code and the network code are stored in the subscriber information storage unit 129 in an equivalent class. Here, the equivalent class of the country code and the network code is to register the country code and the network code with the same home mobile telephone network. When the country code and the network code are registered in an equivalent class, that is, an equivalent class between the respective digits constituting the country code digit 1 to the country code digit 4, and each of the network code digits 1 to the network code digit 2, respectively. If the country code and network code of the location area identifier provided by the mobile communication system when roaming between countries are registered by the equivalent class between the digits of the digits of the digits of the digits of the digits of the digits, it is determined that the same home mobile phone network is the same. The equivalent class for the home mobile telephone network is also stored in the subscriber information storage unit 129 and the home location register of each mobile switching system constituting the mobile communication system.

4 is a flowchart illustrating a mobile phone network access process of a mobile station according to an embodiment of the present invention.

First, in step 411, if the mobile station 100 detects inter-country roaming, for example, inter-country roaming occurs from a first country to a second country, the mobile station 100 proceeds to step 413. In step 413, the controller 111 checks whether a registered PLMN exists in the subscriber information storage 129. Here, it should be noted that the searching operation of the mobile station 100 when accessing the mobile telephone network to be described below is performed with the location area identifier provided by the mobile communication system.

If there is a registered mobile telephone network as a result of the test, the controller 111 proceeds to step 415. In step 415, the control unit 111 accesses and returns to the registered mobile telephone network.

However, since there is no registered mobile telephone network in the subscriber information storage unit 129 according to roaming between countries, the controller 111 proceeds to step 417. In step 417, the controller 111 searches for a PLMN list and proceeds to step 419. In this case, the mobile telephone network list is a first priority mobile telephone network (HPLMN), and secondly, a priority mobile telephone network (Each PLMN in SIM list in priority order) stored in the subscriber information storage unit 129 with priority. , Third preset level, e.g., all other PLMNs above -85dBm in random order, with received power above -85dBm, and finally, received power shift according to the power strength of the received signal. It is composed of a telephone network (Other PLMNsin decreasing order of signal strength), it is to search the mobile telephone network to be accessed by the mobile station 100 sequentially from the home mobile telephone network to the receiving power mobile telephone network.

In step 419, the controller 111 checks whether a home mobile telephone network exists. If there is a home mobile telephone network as a result of the test, the controller 111 proceeds to step 421. In step 421, the control unit 111 accesses and returns to the home mobile telephone network.

If the home mobile telephone network does not exist in step 419, the controller 111 proceeds to step 423. In step 423, the controller 111 checks whether a mobile switching network having a priority, that is, a mobile telephone network corresponding to the priority mobile telephone network in the list of mobile telephone networks exists. If there is a priority mobile telephone network as a result of the test, the controller 111 proceeds to step 425. In step 425, the control unit 111 accesses and returns to the priority mobile telephone network having the priority.

If the priority mobile telephone network does not exist in step 423, the controller 111 proceeds to step 427. In step 427, the control unit 111 checks whether a mobile telephone network having a predetermined power or more, that is, a high level reception power mobile telephone network, exists in the mobile telephone network list. If there is no high level received power mobile telephone network, the controller 111 proceeds to step 429. In step 429, the control unit 111 searches for a mobile telephone network according to signal strength, that is, a reception power mobile telephone network in the mobile telephone network list, and accesses and returns to the corresponding mobile telephone network.

In step 427, if there is a high level reception power mobile telephone network, the controller 111 proceeds to step 431. In step 431, the control unit 111 accesses and returns to the high-level receiving power mobile telephone network having the set power or higher.

FIG. 5 is a signal flow diagram illustrating in detail a process of determining a home mobile telephone network of a mobile station according to an embodiment of the present invention. In particular, FIG. 4 is a signal flow diagram illustrating in detail a process of searching for a home mobile telephone network shown in FIG.

First, when the mobile station 100 is accessed from a first mobile telephone network of a first country and roams between countries in a second country, the mobile station 100 generates a hard hand-off. Roam to two countries. Then, any base station 100 of the second country transmits a frequency correction burst (FB) to the mobile station 100. The mobile station 100 receives the frequency correction burst to obtain frequency synchronization with the base station 110 (step 511). In addition, the base station 110 synchronizes with the frequency correction burst (SB). ) Is transmitted to the mobile station 100. The mobile station 100 receiving the synchronization burst from the base station 110 acquires time synchronization with the base station 110 with the synchronization burst (step 514).

In addition, the base station 110 transmits a broadcast channel BCCH (BroadCast CHannel) to the mobile station 100 (step 515). The mobile station 100 receiving the BCCH from the base station 110 transmits the BCCH. The location area information is detected from the system information, and the location area information (LAI) is searched (step 517). The location area information has the same structure as shown in FIG. Have

After retrieving the location area information, the mobile station 100 checks whether the country code and network code constituting the location area information are registered in the equivalent class of the home mobile telephone network stored in the subscriber information control unit 129. If the country code and the network code are not the country code and the network code registered in the home mobile telephone network equivalent class stored in the subscriber information storage unit 129 (step 519), the mobile station 100 determines the mobile telephone network. It is determined that this is not the home mobile telephone network, and the mobile telephone network search is performed sequentially from the mobile telephone network list except the home mobile telephone network, that is, the priority mobile telephone network (step 521).

On the other hand, if the country code and network code is a country code and network code registered in the home mobile telephone network equivalent class stored in the subscriber information storage unit 129, the mobile station 100 moves the roaming second country. It is determined that the telephone network is the home mobile telephone network (step 523) and accesses to the home mobile telephone network. (Step 525) Access to the home mobile telephone network causes the mobile station 100 to burst the access to the base station 110 (AB: Access Burst). ) Is sent (step 527).

As described above, in the embodiment of the present invention, the country code and the network code for identifying the home mobile telephone network are registered in advance in an equivalent class, so that the home mobile telephone network can be extended even when roaming between countries occurs.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above allows the home mobile phone network to be expanded even when roaming occurs between countries by registering a country code and a network code for identifying the home mobile phone network in advance in an equivalent class.

Accordingly, the mobile station has the advantage of maintaining the concept of the home mobile telephone network in international roaming, so that even when roaming between countries, the same priority is provided as in the home mobile telephone network.

In addition, for a communication service provider, for example, a first service provider, a second service provider in a first country, a third service provider in a second country, and a fourth service provider provide communication services. If the first service provider of the first country and the third service provider of the second country are the same service provider, the mobile service provider can expand the home mobile telephone network even when roaming between countries. It is possible to perform continuously, has the advantage that it is possible to secure a large number of subscribers.

In addition, in the case of an additional service that can be provided only in the home mobile telephone network, the concept of the home mobile telephone network can be continuously extended by roaming between countries of the mobile station, thereby improving service quality.

Claims (15)

A method of extending a home mobile telephone network in a mobile communication system, comprising: a base station and a mobile station connected to the base station to receive a mobile communication service; Receiving location area information through a specific channel from a roamed base station as the mobile station roams; Checking whether the received location information is registered in an equivalent class of a home mobile telephone network which is stored in advance; And a step of determining a mobile telephone network corresponding to the location area information as a home mobile telephone network and accessing the same when the mobile terminal is registered in a home mobile telephone network equivalent class as a result of the inspection. The method of claim 1, And said location area information has a format consisting of a country code, a network code, and a location area code. The method of claim 2, And wherein the country code is a code indicating a country where the mobile station is located. The method of claim 3, And the network code is a code indicating a mobile telephone network for providing a communication service in a country where the mobile station is located. The method of claim 4, wherein And said location area code is a code indicating an area in which said mobile station is located in said mobile phone network. The method of claim 2, And the home mobile telephone network equivalent class is an equivalent class of a code constituting the country code and an equivalent class of a code constituting the network code. The method of claim 1, And if the received location area information is not registered in the equivalent class of the home mobile telephone network, which is stored in advance, searching for the mobile telephone network except the home mobile telephone network from the list of mobile telephone networks. To expand your home mobile phone network. The method of claim 7, wherein The mobile telephone network list; Home mobile phone network, A priority mobile phone network stored with priority; A high level reception power mobile telephone network having a reception power of a preset level; A method for extending a home mobile telephone network in a mobile communication system, characterized in that it consists of a received power mobile telephone network according to the power strength of a received signal. In the home mobile telephone network expansion device of a mobile communication system, A subscriber information storage unit for storing a country code for identifying a home mobile telephone network and each code constituting a network code in a home mobile telephone network equivalent class; When roaming between countries, location area information received through a specific channel is searched, and when the country code and network code of the location area information are stored in the home mobile phone network equivalent class, the roamed mobile phone network is transferred to the home mobile phone network. And a control unit for determining the home mobile telephone network extension device of the mobile communication system. The method of claim 9, And the location area information has a format consisting of a country code, a network code, and a location area code. The method of claim 10, And the country code is a code indicating a country where the mobile station is located. The method of claim 11, And the network code is a code indicating a mobile telephone network for providing a communication service in a country where the mobile station is located. The method of claim 12, And said location area code is a code indicating an area in which said mobile station is located in said mobile phone network. The method of claim 9, If the received location information is not registered in the equivalent class of the home mobile telephone network, the controller searches for the mobile telephone network except for the home mobile telephone network in the list of mobile telephone networks. Device. The method of claim 14, The mobile telephone network list; Home mobile phone network, A priority mobile phone network stored with priority; A high level reception power mobile telephone network having a reception power of a preset level; An apparatus for expanding a home mobile telephone network of a mobile communication system, characterized in that it is composed of a receiving power mobile telephone network according to the power strength of a received signal.