KR20030027314A - Method for Choosing System for Network to Network Interface in Mobile Communication System - Google Patents

Abstract

PURPOSE: A system selection method for interlocking networks of a mobile communication system is provided to utilize idle installation of an existing network positively by providing a system selection function between a new network and an existing network. CONSTITUTION: An MS(Mobile Station) registers a position to an MSC(Mobile Switching Station)/VLR(Visitor Location Register) of a new serving system(201). A position registration of the MSC/VLR of an old serving system is cancelled via a HLR(Home Location Register) and a position registration including a subscriber's profile is performed to the MSC/VLR of the new serving system(202-205). By discriminating existence of a service redirection to a preferred serving system, if there is redirection, a service redirection message is transmitted to the MS(206). The MS registers a position to an MSC/VLR of a preferred serving system(207). A position registration of the MSC/VLR of a new serving system is cancelled via an HLR(Home Location Register) and a position registration including a subscriber's profile is performed in the MSC/VLR of the preferred serving system(208-210).

Description

System selection method for interworking with mobile communication system {Method for Choosing System for Network to Network Interface in Mobile Communication System}

The present invention relates to a system selection method for interworking of a mobile communication system, and in particular, to select an optimal system according to the propensity of a mobile subscriber and the type of service for the efficient use of network resources when mobile networks of different generations exist at the same time. The present invention relates to a system selection method for interworking between networks of a mobile communication system that instructs network reconnection by selecting.

In general, when a mobile network operator wants to introduce a new network according to the trend in the development of mobile network technology, a new network can be created sequentially or locally or sequentially, instead of temporarily forming a national network when developing and applying a new network system. Build.

That is, in some regions, a system of an overlay type in which a new network and an existing network coexist in some regions is constructed, and in another region, a system in which only the old generation network exists.

In this case, if there is no efficient interworking function between the new network and the existing network, the mobile operator invests enormous investment cost at a time to construct and service the nationwide network from the beginning of service introduction, or is very limited to the service user who subscribes to the new service. There is a problem to provide a mobile phone service only in the region.

Network Directed System Selection (NDSS), defined in TIA / EIA / IS-735, is a network function that, when a subscriber attempts to register a location in one location, the home system is directed to another system in that area, depending on the subscriber's preferred system. This function allows you to connect. Newly induced systems can be of any kind, regardless of frequency or band.

The NDSS function is useful when several operators provide mobile communication services in the same region as in the United States. The NDSS function registers a preferred system for each roaming region and induces the user to automatically access the most suitable system.

That is, the NDSS function allows the terminal to automatically access the system preferred by the subscriber without intervention of the subscriber or directs the subscriber to access the most suitable system in the region when registering the location so that the terminal accesses the system preferred by the subscriber. Induce.

The preferred system for each subscriber is managed in the order determined by the subscriber in consideration of the system's tariff policy, call quality, and compatibility with the terminal owned by the subscriber.In order to provide NDSS function, the subscriber roams above all in the home system. It should be possible to register and manage the preferred system in each region.

All wireless operators in our country do not need to use the basic functions of NDSS service as they provide services in all regions and do not provide roaming services with other operators in the same region in Korea.

Therefore, by utilizing the NDSS function, when developing and applying 2.5G system, 2.5G network is configured only in some regions instead of 2.5G network in the whole country at one time and is referred to as existing code division multiple access (hereinafter referred to as 'CDMA'). ) Is required to configure the cellular system and the overlay network.

In this case, the existing CDMA cellular system will be required to utilize the NDSS function to redirect to the 2nd generation or 2.5th generation system according to the type of service required by the terminal accessing the frequency resource of the current system.

The present invention has been proposed in response to the above-mentioned requests, and by providing a system selection function between the new network and the existing network to actively utilize the idle facilities of the existing network and at the same time through the service timing of the new network The purpose of the present invention is to provide a method for selecting a system for interworking with a mobile communication system that can reduce the investment cost and provide efficient use of radio resources by providing a system selection function according to subscriber propensity and service characteristics.

In addition, the present invention provides a system selection function between the new network and the existing network to actively utilize the idle facilities of the existing network and at the same time to reduce the investment cost by adjusting the service timing of the new network, by subscriber preferences and service characteristics Another object of the present invention is to provide a recording medium for realizing a function of efficiently using radio resources by providing a system selection function.

1 is a configuration diagram of a mobile communication system to which the present invention is applied;

2 is a flowchart illustrating a location registration method that does not include authentication in a 2.5 generation system according to the present invention;

3 is a flowchart illustrating a location registration method including authentication in a 2.5 generation system according to the present invention;

4 is a flowchart illustrating a call origination method that does not include authentication in a 2.5 generation system according to the present invention;

5 is a flowchart illustrating a call origination method including authentication in a 2.5th generation system according to the present invention;

6 is a flowchart illustrating a location registration method without authentication in a second generation system according to the present invention;

7 is a flowchart illustrating a location registration method including authentication in a second generation system according to the present invention;

8 is a flowchart illustrating a call origination method not including authentication in a second generation system according to the present invention;

9 is a flowchart illustrating a call origination method including authentication in a second generation system according to the present invention;

According to an aspect of the present invention, there is provided a method of performing a call origination from a new serving system to a preferred serving system, the method comprising: transmitting a calling message from an MS to an MSC / VLR of the new serving system; Canceling the location registration of the MSC / VLR of the old serving system via the HLR, and performing the location registration including the profile of the subscriber in the MSC / VLR of the new serving system; A third step of transmitting a service reconnection message to the MS according to the determination of whether to reconnect the service to the preferred serving system; Transmitting a call message from the MS to the MSC / VLR of the preferred serving system; Via HLR, canceling location registration of MSC / VLR of the new serving system and performing location registration including profile of the subscriber to MSC / VLR of the preferred serving system; And a sixth step of performing a call origination of the MS.

The present invention also provides a device with a microprocessor to provide a method for performing location registration from a new serving system to a preferred serving system, comprising: a first function of performing location registration from an MS to an MSC / VLR of the new serving system; Via HLR, canceling location registration of MSC / VLR of old serving system and performing location registration including profile of subscriber to MSC / VLR of new serving system; A third function of processing transmission of a service reconnection message to the MS according to a determination of whether to reconnect a service to the preferred serving system; A fourth function of performing location registration from the MS to the MSC / VLR of the preferred serving system; And via HLR, cancel a location registration of the MSC / VLR of the new serving system, and implement a fifth function of performing a location registration including the profile of the subscriber in the MSC / VLR of the preferred serving system. It characterized in that it comprises a computer-readable recording medium for recording the.

In addition, the present invention provides a first function of transmitting a call message from an MS to an MSC / VLR of the new serving system to a device equipped with a microprocessor to provide a method for performing a call origination from a new serving system to a preferred serving system. ; A second function of canceling location registration of the MSC / VLR of the old serving system via the HLR and performing location registration including the profile of the subscriber to the MSC / VLR of the new serving system; A third function of determining whether to reconnect a service to a preferred serving system and transmitting a service reconnection message to the MS when reconnecting; A fourth function of sending a call message from the MS to the MSC / VLR of the preferred serving system; Via a HLR, canceling location registration of the MSC / VLR of the new serving system and performing location registration including the profile of the subscriber to the MSC / VLR of the preferred serving system; And a computer-readable recording medium having recorded thereon a program for realizing the sixth function of performing the call origination of the MS.

The NDSS function defined in TIA / EIA / IS-735 defines a method of generating a command in a home location register (hereinafter referred to as an 'HLR') which is a subscriber's home system, but is managed in the present invention. Depending on the frequency resources of the base station and the type of service required by the terminal, the mobile switching center (hereinafter referred to as "MSC") or the base station (hereinafter referred to as "BS") may generate a direct redirection command. Implement

That is, the system stores and manages the preferred system (preferred system (2 generation / 2.5 generation)) information for each subscriber in the HLR, and at the initial location registration, the mobile switching center / visitor location register (hereinafter referred to as 'MSC / VLR'; Visitor Location Register) It is included in the subscriber profile, so that the MSC redirects to the preferred system based on the subscriber's profile in the VLR, and applies the high speed packet data service in the second generation system. At the time of the attempt, the MSC or BS decides to apply the redirection to the 2.5G system.

Therefore, the 2.5 generation network according to the present invention will be configured and operated in the form of an overlay on the existing CDMA cellular network, and separates voice and data in the following manner for efficient distribution of the number of subscribers.

2.5G terminal subscribers are divided into 2.5G preferred 2.5G (2.5G Preferred 2.5G) subscribers and 2G preferred 2.5G (2G Preferred 2.5G) subscribers according to the preferred system.

All 2.5G subscribers (2.5G Preferred 2.5G Subscribers and 2G Preferred 2.5G Subscribers) terminals first select the 2.5G system and program the 2G system in areas where the 2.5G system is inaccessible. Therefore, when the 2G Preferred 2.5G subscriber accesses the 2.5G system, it instructs them to reconnect to the 2G system.

Since high-speed data service is only available in 2.5G system, 2G Preferred 2.5G subscribers requesting high-speed data service in 2G system should be instructed to redirection to 2.5G system. All processing related to the reconnection is performed by the serving MSC or the BS.

In addition, according to the present invention, when providing roaming between the first mobile communication service provider and the second mobile communication service provider, a roaming function is provided locally by dividing roaming allowance and prohibition area for each system (base station). Therefore, when a roaming subscriber attempts to access the system in a roaming prohibited area, a procedure of redirection to the home system of the subscriber is applied.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The system selection function between the existing IS-95A / B system (2nd generation) and IS-95C system (2.5th generation) is based on the NDSS (Network Directed System Selection) function defined in TIA / EIA / IS-735. We will define the functions required to be provided by the 95C system (Generation 2.5).

1 is a block diagram of a mobile communication system to which the present invention is applied.

As shown in the figure, a mobile communication system to which a system selection method for inter-working interworking of the mobile communication system of the present invention is applied includes an HLR 10, an MSC / VLR 20, a base station controller 30; It is composed of 'BSC'), BS 40 and the terminal 50 (Mobile Station (hereinafter referred to as 'MS')).

The HLR 10 of the present invention registers the subscriber's propensity (2G Preferred 2.5G, 2.5G Preferred 2.5G, etc.) in the subscriber profile. In addition, the HLR 10 includes preferred system information in the subscriber profile in the location registration response message (RegistrationNotification Return Result), the authorization information notification message (QualificationDirective Invoke), and the authorization request return message (QualificationRequest Return Result). do.

The MSC / VLR 20 stores preferred system information included in the message in a subscriber database (DB). The MSC / VLR 20 uses a service redirection message (hereinafter referred to as 'SRM') to determine a reconnection instruction to another system (type of location registration, call origination, etc.) and reconnection included in the SRM. Store and manage the parameters of the target system.

In addition, the MSC / VLR 20 registers information necessary for commanding a redirect to a second generation system that is overlaid with its own area as a man machine command (hereinafter referred to as 'MMC'). , Delete, modify and search. In addition, in order to support roaming functions between providers, a function for separately processing each mobile operator's numbering plan area (hereinafter referred to as 'NPA') is required.

Table 1 below is an embodiment of the SRM information according to the present invention.

The REG_SRM is a field for switching (On / Off) the SRM transmission function by location registration. The REG_SRM field indicates whether SRM transmission is performed by actual location registration. That is, if REG_SRM is Off, normal location registration is performed.

ORI_SRM: A field for switching (On / Off) the SRM transmission function by call origination. This field indicates whether SRM transmission is performed by actual call origination. That is, when ORI_SRM is Off, normal location registration and origination processing are performed, and SRM is transmitted at the end of the call.

RETURN_IF_FAIL, BAND_CLASS, EXPECTED_SID, EXPECTED_NID, NUM_CHAN, and CDMA_CHAN are defined in the standard between Air segments (BTS-MS) (IS-95 series) and are included in the SRM message to allow MS to select a new system. A parameter that provides a criterion.

In short, RETURN_IF_FAIL is a parameter that selects whether to return to the original system when the SRM sends MS access to the new system based on the parameters included in the SRM.

BAND_Class is a parameter indicating whether the new system is an 800 MHz or 1.8 GHz system, and EXPECTED_SID means a system ID of the new system. EXPECTED_NID means the network ID of the new system. Each system of the CDMA cellular system is assigned a unique SID and NID in the network.

NUM_CHAN is a parameter indicating the number of CDMA_CHANs included below, and CDMA_CHAN means a CDMA channel number, and means a frequency of a new system.

Alternative_SRM is a field for determining whether to service in 2.5 generation or SRM using other NPA parameters when there is no second generation overlay base station of the corresponding NPA. That is, when Alternative_SRM is ON, the target NPA should be registered and SRM is transmitted including the parameter set in the registered target NPA.

In addition, the MSC has a function (SRM transmission function having different parameters for each NPA) for redirection to the second generation system when the preferred system receives the location registration from the subscriber registered as the second generation. Have

In addition, the MSC instructs the preferred system to redirection to the second generation system when receiving a location registration from a subscriber registered as a second generation, but the terminal fails to obtain the preferred system. Thus, when the location registration is received from the terminal again, it has a function of performing normal location registration (determined by RETURN_CAUSE included in the location registration or origination message).

The BS 40 manages overlay shape information of the second generation base station of the first mobile communication provider and the second generation base station of the second mobile communication service provider for each base station, and has a function of adjusting the MMC by an operator. The following Table 2 is mentioned as an example of the said shape information.

The shape information is a parameter included when the BS 40 sends a registration message and an origination message to the MSC.

A field a indicates a second generation overlay area of the first mobile carrier, '0' indicates not being a second generation overlay area of the first mobile carrier, and '1' indicates the first area. 2 indicates the second generation overlay area of the mobile carrier.

In addition, the field b indicates a second generation overlay area of the second mobile communication carrier, and '0' indicates that the second generation mobile phone is not the second generation overlay area of the second mobile communication carrier, and '1'. Denotes a second generation overlay area of the second mobile communication operator.

Fields c to h are reserved fields for future use.

In addition, the BS 40 has a function of processing an SRM, and has a function of processing a service option 33 (144 kbps packet data service, Internet or ISO protocol stack-TSB58B) for IS-95C.

The MS 50 has a function of calling a service option 33 even in an IS-95A / B network.

Hereinafter, a procedure for instructing to redirect to a preferred system using the NDSS function will be described. The location registration procedure takes into account the case where the subscriber authentication function is performed together or not.

2 is a flowchart illustrating a location registration method without authentication in a 2.5 generation system according to the present invention.

Location registration method that does not include the authentication of the present invention, 2G Preferred 2.5G subscribers (Preferred Serving System) when registering a location as a new serving system (New Serving System) 2.5 generation system (New Serving System) In order to redirect to the 2nd generation system, or to register the location as the 2nd generation New Serving System, the 2.5G Preferred 2.5G subscriber, the Preferred Serving System. The procedure to command to redirect to 2.5G system is shown.

As shown in the figure, in the location registration method that does not include the authentication of the present invention, the MS registers a location with a new serving system (New Serving System) (MSC / VLR2) (201). In this case, the BS (not shown) includes the shape information for identifying whether the area where the location registration has occurred is a second generation base station overlap area of the first mobile communication operator or a second generation base station overlap area of the second mobile communication service provider. Inform. In the present invention, it is set as the second generation base station overlap area.

The New Serving MSC sends a 'RegistrationNotification' (hereinafter referred to as 'REGNOT') message to the HLR associated with the MS (202). The HLR sends a 'RegistrationCancellation (hereinafter referred to as' REGCANC') message to the Old Serving System (203).

The Old Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (204).

'REGCANC' means invoke and 'regcanc' means return result. Similarly, 'REGNOT' means invoke and 'regnot' means return result.

The HLR sends a 'Regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System. (205).

The new serving MSC performs the following operation according to the RETURN_CAUSE parameter value included in the location registration message received from the base station.

If RETURN_CAUSE is not '0000 (normal access)', the subscriber profile received from the HLR is stored and the location registration procedure is terminated.

On the other hand, when RETURN_CAUSE is '0000 (normal access)', the shape information received from the base station is the second generation overlap region, and the subscriber's preferred system information is the second generation preferred 2.5 generation (2G Preferred 2.5G). When REG_SRM is ON, it is determined that redirection should be performed, and a service redirection (SerRed) message including system parameter of the target system and RETURN_IF_FAIL information is transmitted to the MS (206).

If any of the above three conditions are not met, the same process as if RETURN_CAUSE is not '0000'.

The MS finds the MSC / VLR3 of the preferred system according to the command and performs location registration (207). The preferred serving system transmits a 'REGNOT' message to the HLR of the MS (208).

The HLR sends a 'REGCANC' message to the New Serving System (209).

The New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (210).

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the preferred MSC / VLR (211).

The Preferred Serving System sends a 'Registration Accepted Order' message to the MS (212).

3 is a flowchart illustrating a location registration method including authentication in a 2.5 generation system according to the present invention.

Location registration method that includes the authentication of the present invention, the second generation preferred 2.5G (2G Preferred 2.5G) subscribers to the new serving system (New Serving System) is a 2.5 generation system when the location registration is a preferred serving system (Preferred Serving System) Redirected to the 2nd generation system, 2.5G Preferred 2.5G Preferred 2.5G Subscriber is the 2nd generation new serving system (New Serving System) when location registration is the preferred serving system (Preferred Serving System) 2.5 Represents a procedure for instructing a redirect to a generation system.

As shown in the figure, the location registration method including the authentication of the present invention, it is determined that the MS connected to the new Serving System through the received overhead message train (hereinafter referred to as 'OMT'), It is determined that the system requires authentication (301).

The MS registers (302) a location with MSC / VLR2, which is a new serving system (New Serving System), and simultaneously transmits authentication related parameters. At this time, the BS (not shown) includes the MSC including shape information for distinguishing whether the area where the location registration has occurred is a second generation base station overlap area of the first mobile communication operator or a second generation base station overlap area of the second mobile communication operator. To tell. In the present invention, it is set as the second generation base station overlap area.

The New Serving System sends an 'AUTHREQ' message to the HLR associated with the MS (303).

The HLR sends an 'AUTHREQ' message to an Authentication Center (hereinafter referred to as an 'AC'), and the AC performs an authentication algorithm, and then sends an 'authreq' message to the HLR (304). .

The HLR sends an 'authreq' message to the New Serving System (305).

If the authentication for the MS succeeds, the New Serving System sends a REGNOT message to the HLR associated with the MS (306).

The HLR is a 'REGCANC in the Old Serving System (Old Serving System); After sending the message, the old serving system deletes the subscriber's profile and sends a 'regcanc' message to the HLR (307).

The HLR transmits a 'regnot' message including a subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to a new serving system (308).

The new serving MSC of the new serving system performs the following operation according to the RETURN_CAUSE parameter value included in the location registration message received from the base station.

If RETURN_CAUSE is not '0000 (normal access)', the subscriber profile received from the HLR is stored and the location registration procedure is terminated.

On the other hand, when RETURN_CAUSE is '0000 (normal access)', the shape information received from the base station is the second generation overlap region, and the preferred system information of the subscriber is the second generation preferred 2.5 generation (2G Preferred 2.5G), When REG_SRM is ON, it is determined that redirection should be performed, and a service redirection (SerRed) message including system parameters of the target system and RETURN_IF_FAIL information is sent to the base station (309). If any one of the conditions is not satisfied, the processing is the same as if RETURN_CAUSE is not '0000'.

The MS searches for MSC / VLR3, which is a preferred system, according to the command. The MS determines that it is connected to a new serving system through the received OMT, and determines that the system requires authentication (310).

The MS registers a location with MSC / VLR3, which is a preferred serving system, and simultaneously transmits authentication related parameters (311).

The Preferred Serving System sends an 'AUTHREQ' message to the HLR of the MS (312).

The HLR sends an 'AUTHREQ' message to the AC and the AC performs an authentication algorithm and then sends an 'authreq' message to the HLR (313).

The HLR sends an 'authreq' message to the Preferred Serving System (314).

If the authentication for the MS succeeds, the preferred serving system sends a 'REGNOT' message to the HLR associated with the MS (315).

The HLR sends a 'REGCANC' message to the New Serving System and the New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (316).

The HLR transmits a 'regnot' message to the preferred serving system (Preferred Serving System) including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G).

The MSC / VLR3 sends a 'Registration Accepted Order' message to the MS (318).

Hereinafter, when a 2G preferred 2.5G (2G Preferred 2.5G) subscriber attempts to make a call in a 2.5G system and a 2G preferred 2.5G (2G Preferred 2.5G) terminal receives SRM from 2G and reconnects to 2.5G This section describes the procedure when attempting to send by (Redirect).

4 is a flowchart illustrating a call origination method that does not include authentication in a 2.5 generation system according to the present invention.

The call origination method does not include the authentication of the present invention, when the 2G preferred 2.5G (2G Preferred 2.5G) subscriber attempts to make a call in the 2.5G system, the 2G system is a preferred serving system. Shows the procedure for commanding to be redirected.

MS attempts to call from MSC / VLR2, a New Serving System. At this time, the BS (not shown) informs the MSC including the shape information identifying whether the area where the call is attempted is the first mobile communication generation 2 base station overlapping area or the second mobile communication generation 2 base station overlapping area (401). ).

The new serving MSC of the new serving system sends a 'REGNOT' message to the HLR associated with the MS (402).

The HLR sends a 'REGCANC' message to the Old Serving System (403).

The Old Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (404).

The HLR transmits a 'regnot' message including a subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System (405).

The new serving MSC of the new serving system performs the following operation according to the RETURN_CAUSE parameter value included in an origination message received from the base station.

If RETURN_CAUSE is not '0000 (normal access)', the subscriber profile received from the HLR is stored and the outgoing call is processed (next step is omitted).

If the RETURN_CAUSE is '0000 (normal access)', the configuration information received from the BS is the second generation overlap region, and the preferred system information of the subscriber is the second generation preferred 2.5 generation (2G Preferred 2.5G), and the ORG_SRM is If it is ON, it is determined that redirection should be performed, and a service redirection message including system parameter of the target system and RETURN_IF_FAIL information is transmitted to the base station (406).

If the shape information received from the BS is the second generation overlap region, and the subscriber's preferred system information is the second generation preferred 2.5 generation (2G Preferred 2.5G), and the ORG_SRM is OFF, the subscriber profile received from the HLR is stored. Process the outgoing call. After the call is terminated, it is determined that redirection should be performed, and a service redirection message including system parameter of the target system and RETURN_IF_FAIL information is transmitted to the base station (406).

In all cases except for the above two cases, it is treated the same as when RETURN_CAUSE is not '0000'.

The MS attempts to find and call MSC / VLR3, which is a preferred system, according to the command (407).

The preferred serving system transmits a 'REGNOT' message to the HLR of the MS (408).

The HLR sends a 'REGCANC' message to the New Serving System (409).

The New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (410).

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the Preferred Serving System_ (411). At this time, the subscriber's preferred system information received from the HLR recognizes that the second generation preferred 2.5G (2G Preferred 2.5G) and performs the location registration procedure without performing redirection.

The Preferred Serving System processes the call of the MS (412).

5 is a flowchart illustrating a call origination method including authentication in a 2.5 generation system according to the present invention.

The call origination method including the authentication of the present invention reconnects to a second generation system, which is a preferred serving system, when a 2nd generation 2.5G (2G Preferred 2.5G) subscriber attempts to make a call from a 2.5G system. Represents the procedure for commanding (Redirect).

The MS determines that it has connected to a new serving system through the received OMT and determines that the system requires authentication (501).

The MS attempts to make a call in MSC / VLR2, which is the New Serving System, and simultaneously transmits authentication related parameters (502). At this time, the BS (not shown) includes an MSC including shape information for distinguishing whether the area in which the call is attempted is a second generation base station overlap area of the first mobile communication operator or a second generation base station overlap area of the second mobile communication operator. To tell.

The New Serving System sends an 'AUTHREQ' message to the HLR of the MS (503).

The HLR sends an 'AUTHREQ' message to the authentication center (AC) and the AC sends an 'authreq' message to the HLR after performing the authentication algorithm (504).

The HLR sends an 'authreq' message to the New Serving System (505).

The new serving MSC of the new serving system sends a REGNOT message to the HLR associated with the MS (506).

The HLR sends a 'REGCANC' message to the Old Serving System and the Old Serving System deletes the subscriber's profile and then sends a 'regcanc' message to the HLR (507).

The HLR transmits a 'regnot' message to the New Serving System (508), including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G).

The new serving MSC of the new serving system performs the following operation according to the RETURN_CAUSE parameter value included in the outgoing message received from the BS.

If RETURN_CAUSE is not '0000 (normal access)', the subscriber profile received from the HLR is stored and the outgoing call is processed. Next step is omitted.

If the RETURN_CAUSE is '0000 (normal access)', the configuration information received from the BS is the second generation overlap region, and the subscriber's preferred system information is the second generation preferred 2.5 generation (2G Preferred 2.5G), and the ORG_SRM is If it is ON, it is determined that redirection should be performed and a service redirection message including system parameter of the target system and RETURN_IF_FAIL information is sent to the BS (509).

If the shape information received from the BS is a second generation overlap region, and the subscriber's preferred system information is a second generation preferred 2.5 generation (2G Preferred 2.5G), and ORG_SRM is OFF, it is received from the HLR. Store subscriber profiles and handle outgoing calls. After the call is terminated, it is determined that redirection should be performed, and a service redirection message including system parameter of the target system and RETURN_IF_FAIL information is sent to the BS.

In all cases except for the above two cases, it is treated the same as when RETURN_CAUSE is not '0000'.

The MS searches for MSC / VLR3, which is a preferred system, according to the command. The MS determines that it has connected to a new serving system through the received OMT, and determines that the system requires authentication (510).

The MS attempts to call from MSC / VLR3, which is a preferred serving system, and simultaneously transmits authentication related parameters (511).

The preferred serving system sends a 'AUTHREQ' message to the MS's HLR (512).

The HLR sends an 'AUTHREQ' message to the AC and the AC performs an authentication algorithm and then sends an 'authreq' message to the HLR (513).

The HLR sends an 'authreq' message to the Preferred Serving System (514).

If the authentication for the MS succeeds, the Preferred Serving System sends a 'REGNOT' message to the HLR associated with the MS (515).

The HLR sends a 'REGCANC' message to the New Serving System and the New Serving System deletes the subscriber's profile and then sends a 'regcanc' message to the HLR (516). .

The HLR transmits a 'regnot' message including a subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the preferred serving system (517). At this time, it recognizes that the preferred system information of the subscriber received from the HLR is 2G preferred 2.5G (2G Preferred 2.5G) and performs a location registration procedure without performing redirection.

The MSC / VLR3 processes the call of the MS (518).

In the following, based on the NDSS function defined in TIA / EIA / IS-735, system selection function and roaming function between existing IS-95A / B system (2nd generation) and IS-95C system (2.5th generation) can be provided. In this case, we will define the functional specification required to provide system-specific roaming allow and prohibit function in existing IS-95A / B system (2nd generation).

In contrast to conventional mobile communication systems, the following are additional points in the system according to the present invention.

The HLR of the present invention of FIG. 1 can distinguish 2nd generation subscribers, 2.5th generation subscribers in a subscriber profile, and is a preferred system, that is, 2nd generation subscribers, 2nd generation preferred 2.5G (2G preferred 2.5G) subscribers, and 2.5. Add a field indicating a generation 2.5G preferred 2.5G subscriber. In addition, the HLR of the present invention includes Preferred System information in the profile when transmitting a RegistrationNotification Return Result.

The MSC of the present invention is a 2.5 generation system that is responsible for storing and managing Preferred System information included in receiving a RegistrationNotification Return Result, and is overlaid with its own area. It has the function of registering, deleting, modifying, and retrieving the information (RETURN_IF_FAIL, BAND_CLASS, EXPECTED_SID, EXPECTED_NID, NUM_CHANS, CDMA_CHAN) necessary to command Redirect to MMC. At this time, two or more CDMA_CHANs should be registered.

In addition, the MSC of the present invention is responsible for enabling or disabling a redirection function to the MMC, and registering, deleting, modifying, and searching a service option corresponding to an IS-95C (High Speed Packet Data Service) with the MMC. Has the function.

In addition, the MSC of the present invention has a function of redirection to the 2.5th generation system when the preferred system receives the location registration from the subscriber registered as the 2.5th generation. In addition, if the preferred system (Preferred System) receives the location registration from the subscriber registered as 2.5 generations, the command to redirection to the 2.5 generations system, but the terminal fails to obtain the preferred system (Preferred System), Has the function of performing normal position registration upon receiving position registration again. That is, a flag is set when performing a service redirection, and when a location registration is received from a subscriber whose flag is set thereafter, normal location registration is performed without performing redirection.

In addition, the MSC of the present invention is responsible for a function of redirection to a 2.5G system from a 2G Preferred 2.5G subscriber registered normally with a 2G Preferred 2.5G High Speed Packet Data Service. If a 2G preferred 2.5G (2G Preferred 2.5) subscriber requested High Speed Packet Data Service but the current serving MSC cannot perform reconnection (for example, the reconnection feature is disabled or the overlay If there is no (overlayed) 2.5 generation system), in consultation with MS, change to slow service that can be processed in 2nd generation system to process data service.

BS of the present invention must manage the configuration information for each base station to distinguish whether the region can only service 2G, roaming service roaming service area, or 2.5G service area, and to adjust the MMC by the operator Has the function.

An example of the shape information is shown in Table 3 below.

Field a indicates a 2.5 generation overlay area, '0' indicates that the 2.5 generation overlay area is not, and '1' indicates a 2.5 generation overlay area. Field a is a parameter included when the base station sends a location registration message and an origination message to the MSC.

Field b indicates whether roaming is allowed or not. That is, '0' indicates roaming prohibited area, and '1' indicates roaming allowed area.

Field c indicates SO33_SRM (indication of whether to send SRM by SO 33). If '0', the process is the same as the region other than the 2.5 generation overlay area without SRM. If '1', SRM is sent. .

A field d indicates REG_SRM (indication of whether STI roaming related to STI is transmitted by location registration). If '0', the field d processes the same as a roaming allowed region without sending SRM, and if '1', sends SRM.

Field e indicates ORG_SRM (indication of STI roaming related to STI roaming by call origination). If e is 0, the field e is processed in the same way as roaming allowance area without SRM. If e is 1, SRM is transmitted.

Also, fields f through h are preliminary fields for later use.

In addition, the BS of the present invention manages parameters (eg RETURN_IF_FAIL, BAND_CLASS, EXPECTED_SID, EXPECTED_NID, NUM_CHANS, CDMA_CHAN) to be included in the SRM. This SRM parameter information is used when sending SRM from BS to MS.

That is, when the field a value of the shape information is '1', information of RETURN_IF_FAIL / BAND_CLASS / EXPECTED_SID / EXPECTED_NID / NUM_CHANS / CDMA_CHAN should be managed. When the field b value of the shape information is '1', Information of NPA / RETURN_IF_FAIL / BAND_CLASS / EXPECTED_SID / EXPECTED_NID / NUM_CHANS / CDMA_CHAN must be managed.

In addition, the BS of the present invention has added a service redirection message processing function, service option 33 (144 kbps Packet Data Service, Internet or ISO Protocol Stack-TSB58B) for IS-95C (High Speed Packet Data Service) Added treatment function.

In addition, the BS of the present invention refers to the overlay information upon receiving the service option 33, and immediately sends a service reconnection message to the MS in the overlay area, and in consultation with the MS if it is not the overlay area, In case of 13K data service processing area (CSM area), process 13K data call with MSC by processing with existing 13K data service, and in case of 8K data service non-processing area (BSM area), process with existing 8K data service 8K data calls to the MSC.

The MS of the present invention adds a function for making a call with service option 33 even in an IS-95A / B network.

Hereinafter, a procedure of instructing a redirection to a preferred system when registering a location or attempting a high speed data call in a second generation system using the NDSS function will be described. The location registration procedure takes into account the case where the subscriber authentication function is performed together or not.

6 is a flowchart illustrating an embodiment of a location registration method in which authentication is not included in a second generation system according to the present invention.

The location registration method does not include the authentication of the present invention, when a 2G preferred 2.5G (2G Preferred 2.5G) subscriber registers the location as a new serving system (New Serving System) that is a 2.5G system, the preferred serving system (Preferred Serving System) Redirected to the 2nd generation system, and 2.5G preferred 2.5G Preferred 2.5G Preferred Serving System The procedure for instructing to redirect to the 2.5th generation system is shown.

The MS registers with the new serving system (New Serving System) MSC / VLR2 (601). At this time, the BS (not shown) informs the MSC including the shape information for distinguishing whether the area where the location registration has occurred is a second generation area or a second generation and 2.5 generation overlay area. In the present invention, it is set to the second generation and 2.5 generation overlay (overlay) area.

The new serving MSC of the new serving system sends a 'REGNOT' message to the HLR associated with the MS (602).

The HLR sends a 'REGCANC' message to the Old Serving System (603).

The Old Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (604).

The HLR transmits a 'regnot' message including a subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System (605).

The new serving MSC of the new serving system determines that redirection should be performed by referring to the preferred system information of the subscriber and the shape information received from the BS, and the preferred system is preferred to the MS. A service redirection message including information of System) and RETURN_IF_FAIL information is sent, and a flag indicating that the service redirection has been performed is set (606). Thereafter, when receiving a location registration from a subscriber having a flag indicating whether to perform service redirection, the normal location registration procedure is performed without performing redirection, and the following step is omitted.

The MS finds a preferred system MSC / VLR3 according to the command and performs location registration (607).

The preferred serving system transmits a 'REGNOT' message to the HLR of the MS (608).

The HLR sends a 'REGCANC' message to the New Serving System (609).

The New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (610).

The HLR transmits a 'regnot' message to the MSC / VLR of the preferred system including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) (operation 611).

The preferred serving system sends a 'Registration Accepted Order' message to the MS (612).

7 is a flowchart illustrating a location registration method including authentication in a second generation system according to the present invention.

Location registration method including the authentication of the present invention, when the second generation preferred 2.5G (2G Preferred 2.5G) subscribers to the new serving system (New Serving System) is a 2.5 generation system, the preferred serving system (Preferred Serving System) Redirect to the 2nd generation system, and the 2.5G Preferred 2.5G Preferred 2.5G subscriber is the 2nd generation New Serving System, which is the Preferred Serving System. The procedure to command to redirect to the 2.5th generation system is shown.

The MS determines that the new Serving System is accessed through the received OMT, and determines that the system requires authentication (S701).

The MS registers a location with MSC / VLR2, which is a new serving system, and simultaneously transmits authentication related parameters (702). At this time, the BS (not shown) informs the MSC including the shape information for distinguishing whether the area where the location registration has occurred is a second generation area or a second generation and 2.5 generation overlay area. In the present invention, it is set to the second generation and 2.5 generation overlay (overlay) area.

The New Serving System sends an 'AUTHREQ' message to the HLR of the MS (703).

The HLR sends an 'AUTHREQ' message to the AC and the AC performs an authentication algorithm and then sends an 'authreq' message to the HLR (704).

The HLR sends an 'authreq' message to the New Serving System (705).

If the authentication for the MS succeeds, the New Serving System sends a 'REGNOT' message to the HLR (706).

The HLR sends a 'REGCANC' message to the Old Serving System and the Old Serving System deletes the subscriber's profile and then sends a 'regcanc' message to the HLR (707).

The HLR sends a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System (708).

The new serving MSC of the new serving system determines that redirection should be performed by referring to the preferred system information of the subscriber and the shape information received from the BS, and the new serving system ) Sends a service redirection message including the preferred system information and RETURN_IF_FAIL information to the MS and sets a flag indicating that a service redirection has been performed (operation 709).

After that, when the location registration is received from the subscriber whose flag indicating whether to perform the service redirection is set, the normal location registration procedure is performed without performing the redirection, and the next step is omitted.

The MS searches for MSC / VLR3, which is a preferred system, according to the command. The MS determines that it has connected to a new serving system through the received OMT, and determines that the system requires authentication (710).

The MS registers the location with MSC / VLR3, which is a preferred serving system, and simultaneously transmits authentication related parameters (711).

The Preferred Serving System sends an 'AUTHREQ' message to the HLR (712).

The HLR sends an 'AUTHREQ' message to the AC and the AC performs an authentication algorithm and then sends an 'authreq' message to the HLR (713).

The HLR sends an 'authreq' message to the preferred serving system (714).

If authentication for the MS succeeds, the preferred serving system (Preferred ServingSystem) sends a 'REGNOT' message to the HLR (715).

The HLR sends a 'REGCANC' message to the New Serving System, and the New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (716) ).

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the Preferred Serving System (717).

The MSC / VLR3 sends a 'Registration Accepted Order' message to the MS (718).

Hereinafter, a procedure for instructing a second generation preferred 2.5G (2G Preferred 2.5G) subscriber to roam to the second generation system to reconnect to the 2.5th generation system when attempting to call a high-speed packet data service for IS-95C will be described.

8 is a flowchart illustrating a call origination method that does not include authentication in a second generation system according to the present invention.

In the call origination method that does not include the authentication of the present invention, a 2G preferred 2.5G (2G Preferred 2.5G) subscriber attempts to access a High Speed Packet Data Service in a state registered in a 2G system. In this case, the procedure for instructing to reconnect to the 2.5 generation system which is the preferred serving system is shown.

The MS attempts to call the new serving system MSC / VLR2 (801). At this time, the BS (not shown) recognizes the high-speed packet data service option 33 for the IS-95C included in the call message and determines whether or not the overlay region is referred to by referring to the overlay shape information.

In the case of an overlay area, when the SO33_SRM field (field c in Table 3) of the shape information is '1', the BS sends a service redirection message to the MS directly (806). After step "807". If the SO33_SRM field is '0', the process is performed in the same manner as the non-overlay region.

If the area is not an overlay area, the BS, in consultation with the MS, processes a 13K data service in a 13K data service processing area (CSM area) to raise a 13K data call to the MSC, and an 8K data service processing area ( BSM region) processes the existing 8K data service and raises 8K data call to the MSC.

If the subscriber profile exists in the serving MSC, the new serving system sends a location registration response request message to the HLR, cancels the location registration of the old serving system, and omits the step of transmitting the location registration response by the HLR (802 to 805). ).

If no subscriber profile exists and if location registration is not performed at MSC / VLR2, the new serving MSC sends a REGNOT message to the HLR associated with the MS (802).

The HLR sends a 'REGCANC' message to the Old Serving System (803).

The Old Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (804).

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System (805).

The new serving MSC establishes a 13K (or 8K) packet data call through an interworking function (hereinafter referred to as 'IWF') (806), and skips the next step.

The MS searches for and calls MSC / VLR3, which is a preferred system, according to the command (807).

The preferred serving system transmits a 'REGNOT' message to the HLR of the MS (808).

The HLR sends a 'REGCANC' message to the New Serving System (809).

The New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (810).

The HLR sends a 'regnot' message including Preferred System information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the Preferred Serving System (811). At this time, the subscriber's preferred system (Preferred System) information received from the HLR 2G Preferred 2.5G (2G Preferred 2.5G_) or High Speed Packet Data Service Recognizing that the origination, redirection (Redirection) Perform the location registration procedure without

The Preferred Serving System processes the call of the MS (812).

9 is a flowchart illustrating a call origination method including authentication in a second generation system according to the present invention.

In the call origination method including the authentication of the present invention, a preferred serving system (Preferred Serving) is performed when a 2G preferred 2.5G (2G Preferred 2.5G) subscriber attempts a high-speed packet data service while being registered in a 2G system. System) shows how to command to redirect to 2.5 generations.

The MS determines that it has connected to a new serving system through the received OMT, and determines that the system requires authentication (901).

The MS attempts to call at the MSC / VLR2 of the New Serving System and simultaneously transmits authentication related parameters (902). At this time, the BS (not shown) recognizes the high speed packet data service option 33 for IS-95C included in the call message and determines whether the area is an overlay area by referring to the overlay shape information.

In the case of an overlay area, when the SO33_SRM field of the shape information is '1', the BS sends a service redirection message directly to the MS, and the MS transmits a preferred system according to the command. In step 911, MSC / VLR3 is found, it is determined that it is connected to a new serving system through the received OMT, and it is determined that the system requires authentication (910).

If the SO33_SRM field is '0', the process is performed in the same manner as the non-overlay region.

If it is not an overlay area, the BS, in consultation with the MS, processes an existing 13K data service in a 13K data service processable area (CSM area) to raise a 13K data call to an MSC, and processes an 8K data service. In the case of the impossible area (BSM area), 8K data call is raised to the MSC by processing with the existing 8K data service.

The New Serving System sends an 'AUTHREQ' message to the HLR of the MS (903).

The HLR sends an 'AUTHREQ' message to the AC and the AC performs an authentication algorithm and then sends an 'authreq' message to the HLR (904).

The HLR sends a 'authreq' message to the New Serving System (905).

If the subscriber profile exists in the serving MSC, the new serving system requests the location registration to the HLR, cancels the location registration of the old serving system, and receives the location registration response from the HLR (906 to 908).

If no subscriber profile exists and if location registration is not performed at MSC / VLR2, the new serving MSC sends a REGNOT message to the HLR (906).

The HLR sends a 'REGCANC' message to the Old Serving System, and the Old Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (907).

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the New Serving System (908).

The new serving MSC establishes a 13K (or 8K) packet data call over the IWF (909). The next step is omitted.

The MS searches for MSC / VLR3, which is a preferred system, according to the command. The MS determines that a new serving system is accessed through the received OMT, and determines that the MS requires authentication (910).

The MS attempts to make a call in MSC / VLR3, which is a preferred serving system, and simultaneously transmits authentication related parameters (911).

Preferred Serving System sends a 'AUTHREQ' message to the HLR (912).

The HLR sends an 'AUTHREQ' message to the AC and the AC sends an 'authreq' message to the HLR after performing an authentication algorithm (913).

The HLR sends an 'authreq' message to the Preferred Serving System (914).

If the authentication for the MS succeeds, the Preferred ServingSystem sends a 'REGNOT' message to the HLR (915).

The HLR sends a 'REGCANC' message to the New Serving System, and the New Serving System sends a 'regcanc' message to the HLR after deleting the subscriber's profile (916). .

The HLR transmits a 'regnot' message including the subscriber's preferred system information (2G / 2G Preferred 2.5G / 2.5G Preferred 2.5G) to the preferred serving system (917).

At this time, it recognizes that the preferred system information of the subscriber received from the HLR is 2G preferred 2.5G (2G Preferred 2.5G) or high speed packet data service transmission, and performs a location registration procedure without performing redirection. .

The MSC / VLR3 processes the call of the MS (918).

The method of the present invention as described above may be stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) implemented as a program.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, by selecting a system for each subscriber's propensity and service characteristics, it is possible to actively utilize the idle facilities of the existing network and to reduce the investment cost by delaying the investment time of the new network.

In addition, the present invention has the effect of developing an efficient interworking function between the new network and the existing network, it is possible to suppress excessive initial investment in terms of mobile phone network operators when introducing a new service, the service in terms of mobile phone service users From the beginning of the introduction, there is an effect of increasing service satisfaction by generating a service effect by the national network.

Claims (36)

In the method of performing location registration from the new serving system to the preferred serving system, A first step of performing location registration from a terminal (MS) to a mobile switching center and a visitor location register (MSC / VLR) of the new serving system; Via a home location register (HLR), canceling location registration of the MSC / VLR of the old serving system and performing location registration including the profile of the subscriber to the MSC / VLR of the new serving system; A third step of processing a service reconnection message transmission to the MS in accordance with a determination of whether to reconnect a service to the preferred serving system; A fourth step of performing location registration from the MS to the MSC / VLR of the preferred serving system; And A fifth step of canceling the location registration of the MSC / VLR of the new serving system and performing the location registration including the profile of the subscriber to the MSC / VLR of the preferred serving system via the HLR; Method for performing location registration between the mobile communication system comprising a. The method of claim 1, Determining from the overhead message string (OMT) transmitted to the MS to determine whether the new serving system is a system requiring authentication; A seventh step of transmitting authentication-related parameters from the MS to the MSC / VLR of the new serving system if the system requires authentication as a result of the determination of the sixth step; An eighth step of transmitting an authentication message via the HLR from an authentication center (AC) to the MSC / VLR of the new serving system; A ninth step of determining from the OMT transmitted to the MS to determine whether the preferred serving system is a system requiring authentication; A tenth step of transmitting authentication related parameters from the MS to the MSC / VLR of the preferred serving system in case of a system requiring authentication as a result of the determination of the ninth step; And An eleventh step of transmitting an authentication message via the HLR to the MSC / VLR of the preferred serving system from the AC; Method for performing location registration between the mobile communication system further comprising. The method according to claim 1 or 2, The HLR is, And registering preferred system information of the MS of the subscriber in the profile of the subscriber in the location registration response message. The method of claim 3, wherein The preferred system information is, A method for performing location registration between a mobile communication system, characterized in that it is one of a second generation preferred 2.5 generation and 2.5 generation preferred 2.5 generation. The method according to claim 1 or 2, The MSC / VLR, And storing the preferred system information of the HLR in a subscriber database. The method according to claim 1 or 2, The MSC is, And managing the basis of decision for issuing a reconnection message to another system through the service reconnection message. The method according to claim 1 or 2, The MSC is, And managing a parameter of a reconnection target system included in the service reconnection message. The method according to claim 1 or 2, The second step, A twelfth step of transmitting a location registration notification message from the MSC / VLR of the new serving system to the HLR; A thirteenth step of transmitting a location registration cancellation notification message from the HLR to the MSC / VLR of the old serving system; Step 14, transmitting a location deregistration response message from the MSC / VLR of the old serving system to the HLR; And A fifteenth step of transmitting a location registration response message including the preferred system information of the subscriber from the HLR to the MSC / VLR of the new serving system; Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, The third step, And a location registration between the mobile communication systems in a 2.5 generation system. The method according to claim 1 or 2, The third step, A twelfth step of transmitting a reconnection message including an upper parameter (RETURN_IF_FAIL) from the BS to the MS; If the parameter RETURN_CAUSE is '0000', it is determined whether to perform reconnection. If reconnection is required, a service reconnection message is transmitted from the MSC / VLR of the new serving system to the MS and reconnection is performed. A thirteenth step of terminating the location registration procedure if it is not required And If the parameter RETURN_CAUSE is not '0000', step 14 of performing a normal location registration procedure Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, The third step, And a location registration between the mobile communication systems in a second generation system. The method according to claim 1 or 2, The third step, A twelfth step of transmitting a service reconnection message including information of a preferred system and a parameter (RETURN_IF_FAIL) from the BS to the MS; And Step 13 of setting a flag indicating that the service reconnection has been performed Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, The fifth step, A twelfth step of transmitting a location registration notification message from the MSC / VLR of the preferred serving system to the HLR; A thirteenth step of transmitting a location registration cancellation notification message from the HLR to the MSC / VLR of the new serving system; A step 14 of transmitting a location registration cancellation response message from the MSC / VLR of the new serving system to the HLR; And A fifteenth step of transmitting the location registration response message including the preferred system information of the subscriber from the HLR to the MSC / VLR of the preferred serving system; Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, The eighth step, A twelfth step of transmitting an authentication request notification message from the MSC / VLR of the new serving system to the HLR; A thirteenth step of transmitting an authentication request notification message from the HLR to the AC; A fourteenth step of transmitting an authentication request response message from the AC to the HLR; And A fifteenth step of transmitting an authentication request response message from the HLR to the MSC / VLR of the new serving system; Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, The eleventh step, A twelfth step of transmitting an authentication request notification message from the MSC / VLR of the preferred serving system to the HLR; A thirteenth step of transmitting an authentication request notification message from the HLR to the AC; A fourteenth step of transmitting an authentication request response message from the AC to the HLR; And A fifteenth step of transmitting an authentication request response message from the HLR to the MSC / VLR of the preferred serving system; Method of performing a location registration between the mobile communication system comprising a. The method according to claim 1 or 2, Wherein the new serving system is a 2.5 generation system and the preferred serving system is a second generation system. The method according to claim 1 or 2, Wherein the new serving system is a second generation system and the preferred serving system is a 2.5 generation system. In the method for performing call origination from the new serving system to the preferred serving system, Transmitting a call message from an MS to an MSC / VLR of the new serving system; Canceling the location registration of the MSC / VLR of the old serving system via the HLR, and performing the location registration including the profile of the subscriber in the MSC / VLR of the new serving system; A third step of processing a service reconnection message transmission to the MS in accordance with a determination of whether to reconnect a service to the preferred serving system; Transmitting a call message from the MS to the MSC / VLR of the preferred serving system; Via HLR, canceling location registration of MSC / VLR of the new serving system and performing location registration including profile of the subscriber to MSC / VLR of the preferred serving system; And Step 6 of performing call origination of the MS Method for performing call origination between mobile communication systems comprising a. The method of claim 18, Determining from the OMT transmitted to the MS to determine whether the new serving system is a system requiring authentication; An eighth step of transmitting authentication related parameters from the MS to the MSC / VLR of the new serving system when the system requires authentication in the sixth step; A ninth step of transmitting an authentication message via the HLR from an authentication center (AC) to the MSC / VLR of the new serving system; Determining from the OMT transmitted to the MS to determine whether the preferred serving system is a system requiring authentication; An eleventh step of transmitting an authentication related parameter from the MS to an MSC / VLR of the preferred serving system when the system requires authentication in the tenth step; And A twelfth step of transmitting an authentication message via the HLR from the AC to the MSC / VLR of the preferred serving system; Method for performing call origination between the mobile communication system further comprising. The method of claim 18 or 19, The HLR is, And registering preferred system information of the MS of the subscriber in the profile of the subscriber in the location registration response message. The method of claim 18, The preferred system information is, A method for performing call origination between mobile communication systems, characterized in that it is one of 2nd generation preferred 2.5th generation and 2.5th generation preferred 2.5th generation. The method of claim 18 or 19, The MSC / VLR, And storing preferred system information of the HLR in a subscriber database. The method of claim 18 or 19, The MSC is, And managing the basis of decision for giving a reconnection message to another system through the service reconnection message. The method of claim 18 or 19, The MSC is, And managing a parameter of a reconnection target system included in the service reconnection message. The method of claim 18 or 19, The second step, A thirteenth step of transmitting a location registration notification message from the MSC / VLR of the new serving system to the HLR; Step 14, transmitting a location registration cancellation notification message from the HLR to the MSC / VLR of the old serving system; A fifteenth step of transmitting a location deregistration response message from the MSC / VLR of the old serving system to the HLR; And A sixteenth step of transmitting a location registration response message including the preferred system information of the subscriber from the HLR to the MSC / VLR of the new serving system; Method for performing call origination between the mobile communication system comprising a. The method of claim 18 or 19, The third step, Method for performing call origination between the mobile communication system, characterized in that the 2.5 generation system provides location registration between the mobile communication system. The method of claim 18 or 19, The third step, A thirteenth step of transmitting a reconnection message including a parameter (RETURN_IF_FAIL) from the BS to the MS; If the parameter RETURN_CAUSE is '0000', it is determined whether to perform reconnection. If reconnection is necessary, a service reconnection message is transmitted from the MSC / VLR of the new serving system to the MS and reconnection is performed. A step 14 of terminating the location registration procedure if it is not necessary to perform it; And When the parameter RETURN_CAUSE is not '0000', a fifteenth step of performing a normal location registration procedure and performing a normal call origination Method for performing call origination between the mobile communication system comprising a. The method of claim 18 or 19, The third step, And a second generation system providing location registration between the mobile communication systems. The method of claim 18 or 19, The third step, A thirteenth step of transmitting a service reconnection message including information of a preferred system and a parameter (RETURN_IF_FAIL) from the BS to the MS; And Step 14 of setting a flag indicating that a service reconnection has been performed Method for performing call origination between mobile communication systems comprising a. The method of claim 18 or 19, The fifth step, A thirteenth step of transmitting a location registration notification message from the MSC / VLR of the preferred serving system to the HLR; A step 14 of transmitting a location registration cancellation notification message from the HLR to the MSC / VLR of the new serving system; A fifteenth step of transmitting a location deregistration response message from the MSC / VLR of the new serving system to the HLR; And Step 16, transmitting the location registration response message including the preferred system information of the subscriber from the HLR to the MSC / VLR of the preferred serving system; Method for performing call origination between the mobile communication system comprising a. The method of claim 18 or 19, The ninth step, A thirteenth step of transmitting an authentication request notification message from the MSC / VLR of the new serving system to the HLR; A fourteenth step of transmitting an authentication request notification message from the HLR to the AC; A fifteenth step of transmitting an authentication request response message from the AC to the HLR; And A sixteenth step of transmitting an authentication request response message from the HLR to the MSC / VLR of the new serving system; Method for performing call origination between the mobile communication system comprising a. The method of claim 18 or 19, The twelfth step, A thirteenth step of transmitting an authentication request notification message from the MSC / VLR of the preferred serving system to the HLR; A fourteenth step of transmitting an authentication request notification message from the HLR to the AC; A fifteenth step of transmitting an authentication request response message from the AC to the HLR; And Step 16 of transmitting an authentication request response message from the HLR to the MSC / VLR of the preferred serving system; Method for performing call origination between the mobile communication system comprising a. The method of claim 18 or 19, The new serving system is a 2.5 generation system, and the preferred serving system is a second generation system. The method of claim 18 or 19, The new serving system is a second generation system, and the preferred serving system is a 2.5 generation system. In a device with a microprocessor to provide a method for performing location registration from the new serving system to the preferred serving system, A first function of performing location registration from the MS to the MSC / VLR of the new serving system; Via HLR, canceling location registration of MSC / VLR of old serving system and performing location registration including profile of subscriber to MSC / VLR of new serving system; A third function of processing a service reconnection message transmission to the MS in accordance with a determination of whether to reconnect a service to the preferred serving system; A fourth function of performing location registration from the MS to the MSC / VLR of the preferred serving system; And A fifth function of canceling location registration of the MSC / VLR of the new serving system via HLR and performing location registration including the profile of the subscriber to the MSC / VLR of the preferred serving system; A computer-readable recording medium having recorded thereon a program for realizing this. In a device with a microprocessor to provide a method for performing call origination from the new serving system to the preferred serving system, A first function of sending a call message from an MS to an MSC / VLR of the new serving system; A second function of canceling location registration of the MSC / VLR of the old serving system via the HLR and performing location registration including the profile of the subscriber to the MSC / VLR of the new serving system; A third function of processing a service reconnection message transmission to the MS in accordance with a determination of whether to reconnect a service to the preferred serving system; A fourth function of sending a call message from the MS to the MSC / VLR of the preferred serving system; Via a HLR, canceling location registration of the MSC / VLR of the new serving system and performing location registration including the profile of the subscriber to the MSC / VLR of the preferred serving system; And Sixth function for performing call origination of the MS A computer-readable recording medium having recorded thereon a program for realizing this.