KR100376911B1 - Registration method of mobile station for private network BTS in cellular system - Google Patents

Abstract

When a private network base station is installed in a specific area, the present invention effectively registers a mobile station with a corresponding private network base station without additional adjustment of an existing public network system, so that local call routing and specific local service distinguished from the public network can be provided. A mobile station location registration method for operating a private network base station in a cellular system, comprising: a first step of broadcasting by setting a registration period value in a system parameter message of a page channel of a private network base station relatively smaller than that of a public network base station (S301); , S302); A second step (S303, S304, S305) of determining whether to be a subscriber based on preset subscriber information when receiving a registration or termination request message from any mobile station; And a third step (S306) in which the subscriber responds after registration or termination, and the non-subscriber responds only without registration or termination.

Description

Mobile station location registration method for operation of private network base station in cellular system {Registration method of mobile station for private network BTS in cellular system}

The present invention relates to a mobile station location registration method for operating a private network base station in a cellular system. More specifically, when a private network base station is installed in a specific area, the mobile station can be effectively registered with the private network base station without additional adjustment of the existing public network system. It is to provide a mobile station location registration method for the operation of a private network base station in a cellular system that can provide local call processing and local service distinct from the public network.

In general, a cellular mobile communication system consists of cells divided into entire base stations (BTSs), and these base stations are under the centralized control of a mobile switching center (MSC), so that the mobile station continues to make calls while moving between cells. To help.

This is done by storing the location information of the mobile station in the home location register (HLR) and the visitor location register (VLR), which are the mobile station information storage devices of the cellular system, when the mobile station first applies for cellular service. The information is stored in the home location register of the area where the service is applied.

When the mobile station moves, the mobile station registers the location information of the mobile station in the visitor location register to which the mobile station belongs, and informs the home location register of the mobile station so that when a call is received from the outside, the home location register locates the mobile station. Only the mobile station knows which visitor location registers it is in, so that the incoming call can be successfully performed.

FIG. 1 is a view for explaining a method for registering a location of a mobile station according to the prior art. As shown in the figure, the mobile station 11 has a corresponding zone (ZONE 1) 13 of a visitor location register (VLR1) 12. In the state of registering to the visitor location register (VLR2) 14 when moving to the corresponding zone (ZONE 2) 15, the visitor location register 14 receives a location registration request message from the mobile station 11. Receive it and transmit it to the Home Location Register (HLR) 16.

The home location register 16 deletes the location information of the visitor location register 12 previously stored, and requests the visitor location register 12 to delete the location registration information of the mobile station 11.

When the registration deletion request response is received from the visitor location register 12, the home location register 16 sends a location registration request response message to the new visitor location register 14, and the location of the mobile station 11 is updated. do.

2 shows a general structure when a private network base station is operated in an existing cellular system. The existing cellular public network system includes a public network base station 21, a base station controller 22, a mobile switching center 23, a visitor location register 24, It consists of a home location register (25), and a private network base station (26) is connected to the base station controller (22).

The private network base station 26 is in charge of the service of a specific area 26a as in a building, and has its own database for storing the call agent function and the location information of the subscriber mobile station. In this building (26a), the subscriber to the private network base station 26 is provided with a service differentiated from the non-subscriber. In addition, the non-subscriber also serves as a relay of the public cell 21a to compensate for the shadow area in the building 26a from the public macro cell 21a which is the service area of the public network base station 21. Perform.

In order for a subscriber to be provided with a differentiated service from an existing cellular system, only the subscriber should be registered as the private network base station 26 by being distinguished from the non-subscriber, and only the registered subscriber becomes a new service target of the private network base station 26. .

When the private network base station 26 is configured as a new registration area different from the existing public cell 21a in the structure as described above, the number of buildings in one public cell, that is, the number of the private network base station 26 as described above. As a result, a series of processes of registering and canceling registration information of a mobile station occurs numerous times, and thus, a large amount of overload occurs not only in the battery life of the mobile station but also in an existing cellular system. Setting the service area to the same registration area solves the problem of configuring a new registration area different from the above-mentioned public cell. Therefore, in the present invention, the registration area of the public cell and the private network base station are set to be the same, and the problems associated therewith are solved to solve the problem of registration generated when the private network base station operates.

Looking at the standard of IS-95 A / B that composes the current cellular system, the following 9 methods are used in parallel for the registration method of the mobile station.

① Power Up Registration

② Power down registration

③ Timer Based Registration

④ Distance Based Registration

⑤ Zone Based Registration

⑥ Registration by base station command (Ordered Registration)

⑦ Implicit Registration

⑧ Traffic Channel Registration

⑨ Parameter change registration of mobile station

However, when the existing mobile station registration method is applied to the operation of the private network base station in the existing cellular system, the following series of problems occur.

First, a problem that occurs when a mobile station in an idle state moves from a public cell to a private network base station area is as follows.

The idle mobile station performs idle handoff to the private network base station having a larger pilot strength according to the pilot strength of the base station without transmitting any information to the private network base station. At this time, since the private network base station is not a new registration area that is distinguished from the public cell, but is only included in the public cell, the mobile station tunes to the new base station, the private network base station, but does not newly register.

Therefore, even if the subscriber enters the service area, the private network base station cannot determine the subscriber's entry unless the subscriber mobile station registers, and this situation may occur after a certain time due to time based registration. According to the registration period of the mobile station transmitted from the public network, it continues until the mobile station applies for registration.

In general, the time-based registration period of the existing cellular system is set long, because in the cellular system based on the Zone Based Registration, it is used as a method for periodically re-checking the position of the mobile station.

In the worst case, if the time-based registration period does not expire for a period of time until the subscriber mobile station enters the area of the private network base station and then goes back to the public macro cell, the subscriber may receive service from the private network base station. It may happen that you signed up for the service but you can't get the service.

In addition, even if the time-based registration period has expired and registered with the private network base station, it takes a long time until a new registration request, a problem that the subscriber does not receive a new service of the private network base station for a long time.

Second, the problem that occurs when an idle mobile station moves from a private network base station to a public cell is as follows.

The idle mobile station performs idle handoff to the public cell base station having a larger pilot strength according to the pilot strength of the base station without transmitting any information to the public network base station. At this time, the mobile station tunes to the public cell, but since the private network base station is the same as the registration area of the public cell, the mobile station does not newly register the public cell. However, since the information of the mobile station is already stored in the public cell, there is no problem in providing a service from the public cell. This means that even if the initial mobile station registers with the visitor location register of the public cell and then registers with the private network base station after entering the private network base station, there is no basis for deleting the information of the current visitor location register because the mobile station has not moved to the new registration area. Because there is no. This registration method actually registers dually with the public cell and the private network base station. However, in the service area of the private network base station, the subscriber and the non-subscriber receive only the differentiated service, and all of them operate using only the private network base station.

However, the problem here is that the subscriber in the service area of the private network base station has applied for a call to another subscriber who has moved from the private network base station to the public cell. Since it is not deleted, the private network base station does not know that the subscriber has moved to the public cell. Accordingly, the private network base station determines that the subscriber is still inside, and attempts to connect internally the call to be sent to the outside to connect. This continues until the subscriber's location registration information is deleted from the private network base station, which causes a problem of failure of continuous call connection until the subscriber's location registration information is deleted.

Third, the problem that occurs when the mobile station is powered off to enter the service area of the private network base station to turn on the power as follows.

When the mobile station is powered on, it tunes and registers with the private network base station according to the power up registration provided in the IS-95 A / B standard. However, when an incoming call comes from an external public switched telephone network (PSTN) or another mobile station using a public cell base station, the home location register and the visitor location register do not contain the location information of the mobile station, and thus the incoming call cannot be connected. Problems arise.

Fourth, the problem occurs when the idle mobile station enters the service area of the private network base station and turns off the power.

When the mobile station is turned off in the service area of the private network base station, it requests the deletion of the registration information to the private network base station according to the power down registration provided in the IS-95 A / B standard. However, since the location registration deletion request is not performed to the public cell at this time, the location registration information of the public cell is still stored in the home location register or the visitor location register of the public cell. When an incoming call from another mobile station using the base station comes in, it continues to call the mobile station through the page channel. The problem here is that since the mobile station is powered off, the call is made through the page channel, which would not have to be performed if the mobile station location registration information was deleted, thereby increasing the load on the air cell and wasting the channel. have.

The present invention was created to solve the problem of the conventional mobile station registration method that occurs when operating a private network base station as part of a public cell as described above, the object of which is based on the time-based registration in the IS-95 standard It is an object of the present invention to provide a mobile station location registration method for operation of a private network base station in a cellular system that provides an optimal registration method for various communication situations.

Another object of the present invention is to store the subscriber's information in the private network base station separately when operating the private network base station as part of the public cell, so as not to use the base station of the public cell in the private network base station service area, the local call in the private network base station itself It is an object of the present invention to provide a mobile station location registration method for operation of a private network base station in a cellular system that enables processing.

It is another object of the present invention to provide a mobile station location registration method for the operation of a private network base station in a cellular system that enables to provide specific services distinguished from a public cell by using the registration information of the mobile station when the private network base station is operated. It is.

1 is a view for explaining a location registration method of a mobile station according to the prior art,

2 is a diagram illustrating a general structure in which a private network base station is operated in an existing cellular system.

3 is a flowchart illustrating a registration method of a mobile station according to the present invention when an idle mobile station 31 enters a service area of a private network base station 32;

4 is a flowchart illustrating a method for registering a corresponding mobile station according to the present invention when an idle mobile station moves from a private network base station to a public cell;

5 is a flowchart illustrating a method for registering a mobile station according to the present invention when the mobile station, which is powered off, enters a service area of a private network base station and is turned on.

6 is a flowchart illustrating a method for registering a mobile station according to the present invention when an idle mobile station enters a service area of a private network base station and is turned off.

7 and 8 are flowcharts showing an example of a call processing process according to the present invention.

※ Explanation of code for main part of drawing

22 base station controller 23 mobile switching center

24: Visitor Location Register 25: Home Location Register

31,41,51,61: mobile station 26, 32, 42, 52, 62: private network base station

21,43,53,63: Public network base station 44,54,64: Public network system

In order to achieve the above object, a mobile station location registration method for operating a private network base station in a cellular system according to the present invention is a location registration method of a mobile station when operating a private network base station as part of a mobile communication system. A first step of broadcasting by setting a registration period value in a system parameter message of a page channel of a base station relatively smaller than that of a public network base station; A second step of determining whether to be a subscriber based on preset subscriber information when receiving a registration or termination request message from any mobile station; And a third step in which the subscriber responds after registration or termination, and the non-subscriber responds only without registration or termination.

In addition, the registration period for each registered subscriber is calculated based on the set registration period value, and if there is a subscriber who does not have a registration request even after passing the set registration period value, the subscriber mobile station registers the registration by a command. After transmitting a registration request command by using the service, if there is no response, the location information of the corresponding subscriber is deleted.

In addition, the registration type field of the received registration request message is examined, and if the message is registered when the power is turned on or off, the information of the mobile station is provided to the public network system to be updated.

Hereinafter, a mobile station location registration method for operating a private network base station in a cellular system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a method of registering a corresponding mobile station according to the present invention when the idle mobile station 31 enters the service area of the private network base station 32.

In this case, the mobile station 31 in the initial idle state is idle handoff to the private network base station 32 having a larger pilot strength according to the pilot strength without transmitting any information to the public network base station. Will be performed. At this time, since the private network base station 32 is not a new registration area that is distinguished from the public cell but is only included in the public cell, the mobile station 31 tunes to the private network base station 32, which is a new base station. It is not newly registered (S301).

Like the public network base station, the private network base station 32 transmits a message to mobile stations in the same area through the page channel, and at this time, the value of the registration period parameter REG_PRD in the system parameter message of the page channel is transmitted. By adjusting and broadcasting to a value smaller than that in the public network, the mobile station 31 entering the service area of the private network base station 32 induces registration in a short period (S302).

Upon receiving this message, the mobile station 31 changes its registration period parameter value (S303), and when the registration period expires, requests for location registration to the private network base station 32 (S304).

The private network base station 32, which has received a location registration request from the mobile station 31, stores the information if the subscriber is compared with the subscriber list in the internal database, and if the subscriber is not the subscriber (S305), the mobile station does not store the information. A registration request response (ACK) is sent to 31 (S306).

As described above, by shortly changing the registration period of the mobile station, it is possible to solve the problem that the mobile station does not register with the private network base station for a long time. If the incoming call occurs and a message is received from the page channel of the private network base station before the registration period of the mobile station expires, that is, the registration request has not yet been made to the private network base station, the private network base station through the page response. It is possible to recognize that this mobile station has entered the service area, and thus can successfully store the location information of the mobile station through implicit registration. The non-subscriber also adjusts the registration period according to the system parameter message when entering the service area of the private network base station.

In this case, the non-subscriber is compensated for the shadow area in the building using the private network base station, but performs a frequent registration request like the subscriber. Frequently, the non-subscriber's frequent registration requests are not a problem, which is typically only 6 registrations per hour if the registration period of the private network base station is 10 minutes, compared to the subscriber. Staying inside is not expected to be very long, so it will not have a big impact on battery consumption. Rather, by operating a private network base station, the non-subscriber will be compensated for the shadow areas in the building and will be provided with services from better public cells.

4 is a flowchart illustrating a method for registering a corresponding mobile station according to the present invention when the idle mobile station moves from a private network base station to a public cell.

In this case, the initial idle mobile station 41 performs idle handoff to the public network base station 43 having a larger pilot strength according to the pilot strength without transmitting any information to the public cell base station. Done. At this time, since the private network base station 42 is not included as a new registration area separate from the public cell but is included in the public cell, the mobile station 41 is tuned to the public network base station 43, which is a new base station. Registration is not performed (S401).

The public network base station 43 adjusts the registration period of the mobile station 41 to the registration period of the public cell through the system parameter message of the paging channel (S402).

The mobile station 41 updates the registration period received from the existing private network base station 42 to the registration period of the public cell according to the system parameter message received from the public cell (S403).

In the case of a subscriber, the private network base station 42 operates a timer according to a mobile station registration period according to stored subscriber information. If the subscriber registered in the private network base station 42 does not make a new registration request even after this prescribed registration period passes (S404), the private network base station 42 registers the registration period using an ordered registration by a base station command. In step S405, the subscriber sends a registration request command to the corresponding subscriber, and if there is no response from the subscriber, it is determined that the service area has been departed and the subscriber information is deleted from the subscriber list of the database (S406). In this case, the non-subscriber does not have a problem because it is not stored in the database of the private network base station.

When the registration period adjusted by the public cell passes (S407), the mobile station 41 moves to the public cell makes a registration request to the public network base station 43 (S408).

The public network base station 43 receiving the registration request of the mobile station 41 transmits the information of the mobile station to the visitor location register and the home location register of the public macro cell system network 44 (S409).

Since the public network system 44 stored the location information of the mobile station 41 without deleting it (S410), it transmits a response to the registration request (S411).

The public network base station 43 receiving the registration request response notifies the mobile station 41 that the registration request has been successfully performed (S412). The subsequent process is the same as the existing system.

5 is a flowchart illustrating a method for registering a mobile station location according to the present invention when the mobile station, which is powered off, enters a service area of a private network base station and is turned on.

When the mobile station 51 entering the service area of the private network base station 52 is turned on (S501), it tunes to the corresponding private network base station 52 (S502), and then accesses the private network base station 52 through an access channel. In step S503, a registration request message is sent.

When receiving the location registration request message, the private network base station 52 stores the location information of the subscriber mobile station if the subscriber is compared with the subscriber list, and if not, does not store it (S504), and then sends a registration request response message (S505). .

The private network base station 52 checks the registration type (REG_TYPE) field of the location registration request message from the mobile station 51, and if the message is power up registration (S506), that is, 0001. If so, the mobile station transmits the location information of the mobile station to the visitor location register (VLR) or the home location register (HLR) as the location registration device of the public network system 54 (S507).

The visitor location register or home location register of the public network system 54 receiving the location information of the mobile station stores the location information of the mobile station (S508), and sends a response message to the registration request (S509).

In this manner, the mobile station, which is powered off, is turned on in the service area of the private network base station, thereby preventing the unregistered situation of the mobile station occurring in the public network system.

6 is a flowchart illustrating a method for registering a mobile station location according to the present invention when an idle mobile station enters a service area of a private network base station and is turned off.

When the mobile station 61 in the dormant state enters the service area of the private network base station 62 and presses the power-off switch (S601), the private network base station 62 is sent to the private network base station 62 by registration when the power is turned off (Power Off Registration). A request is made to delete the location information 61) (S602).

The private network base station 62 receiving this location registration message (i.e., location information deletion request message) deletes the location information of the mobile station from the subscriber information list if it is a subscriber mobile station (S603). A response to the location registration deletion request is sent without having to delete the location information (S604). The mobile station 61, which has received the response of step S604, is powered off (S605), and the private network base station 62 registers the location. If the message is registered when the power is turned off, that is, 0011 (S606), the location information of the mobile station is deleted from the visitor location register or home location register of the public network system 64. Make a request (S607)

The visitor location register or home location register of the public network system 64 deletes the requested location information of the mobile station (S608) and then responds to the request for deleting the location information (S609).

As described above, when the idle mobile station is turned off in the service area of the private network base station, unnecessary waste of page channel resources caused by not being detected by the public network system can be prevented.

As described above, in the area where the private network base station according to the present invention is applied, various call processing cases occur due to the mobility characteristics of the mobile station between the private network and the adjacent public network. In addition, since private network systems have different characteristics of call processing according to subscribers or non-subscribers, scenarios for various cases must exist.

If the mobile station requests a call in the service area of the private network base station, when the mobile station sends a call origination message, the private network base station processes the implicit location according to the mobile station information as implicit registration and calls the appropriate call. Processing can be performed. Therefore, only the case where the mobile station is incoming will be considered here. On the other hand, even if a non-subscriber enters a private network service area, there is no change in the call processing method by the private network system because only local call processing is performed without performing local routing in the area. .

When receiving a call from a private network subscriber station in a private network, after entering the private network base station and performing the initial registration process, the non-subscriber does not record in the local database of the private network base station. If you are a subscriber, you will receive services specific to private network base stations, including local call processing.

However, if the subscriber receives a call request from the local mobile terminal before the initial registration while entering the private network base station, the subscriber cannot perform a general local call processing process and needs special processing. A flowchart illustrating a call processing process according to the present invention.

First, the mobile station 71 in the area of the private network base station 72 requests a call from the private network base station 72 to talk to another subscriber mobile station 77 in the same area (S700).

The private network base station 72 allocates a channel to the call originating mobile station 71 (S701) and checks whether the information of the mobile station 77 to which the call is to be received is recorded in the database of the private network base station 72. In this case, since it is not recorded in the database of the private network base station 72, call processing is requested to the public network (S702, S703), and the terminating mobile station 77 is not yet registered with the call originating mobile station 71, so that the local call processing service is not registered. It tells you that you can not receive a comment (S704). In addition, the call originating mobile station 71 asks whether to receive service even for a fee, and the corresponding user decides according to the message displayed on the screen (S705).

On the other hand, at the same time as the process of sending and processing the message to perform a call processing process in the public network, the mobile switch 73 receiving the call origination message from the private network base station 72 in step S703 is home location register 75 Ask the location of the destination mobile station 77 (S707) and the home location register 75 informs the mobile switchboard 73 the visitor location register 74 that includes the destination mobile station 77 (S108).

The mobile switching unit 73 locates the destination mobile station 77 through the visitor location register 74 (S709) and requests paging to the corresponding public network base station 76 (S710).

The following process is performed in the same manner as call processing in the public network (S711-S718), and this series of processes can be performed only when the call originating mobile station 71 is willing to accept a toll call. Otherwise, the call is terminated as soon as a message is received from the call originating mobile station 71 about the rejection of the pay call transmission (S706).

After such a call process is performed, the private network base station can recognize that the subscriber mobile terminal has entered the area, so that it is recorded in the database of the private network base station and the subscriber mobile station can receive local call processing service normally from the next call.

In addition, among mobile subscriber stations receiving a call request from a local mobile station, a mobile station moving from a private network to a public network may receive a call request before erasing the contents recorded in the private network base station. A flowchart illustrating a call processing process according to the present invention.

First, the mobile station 81 in the area of the private network base station 82 requests a call from the private network base station 82 to talk to another subscriber mobile station 87 in the same area (S800).

The private network base station 82 assigns a channel to the call originating mobile station 81 (S801) and sends a paging to find the mobile station 87 to which the call is to be received, but in this case, the paging response until the preset timer expires. If the call does not come (802), since local call processing is not possible, information is deleted from the database of the private network base station 82 (S803). The call originating mobile station 81 is called by the destination mobile station 87 to the private network base station 82. At the same time (S804), the notification request that the call to the public network requests the call processing (S805).

At this time, even if the timer expires unconditionally erasing the information of the mobile station may be temporarily unable to respond due to environmental factors, etc. If the paging to find the destination mobile station 87 once again, if there is no response, there is also a method of erasing from the record. However, since the delay due to registration cannot be long during call processing, it should be used by shortening the timer and checking again. In addition, the call originating mobile station 81 asks whether to receive service even for a fee, and the corresponding user decides according to the message displayed on the screen (S806).

Meanwhile, a call processing process is performed in the public network at the same time as the process of sending and processing a message. In step S805, the mobile switching center 83 receiving the call origination message from the private network base station 82 is the home location register 85. Ask the location of the destination mobile station 87 (S808) and the home location register 85 informs the mobile switchboard 83 the visitor location register 84 that includes the destination mobile station 87 (S809).

The mobile switch 83 locates the destination mobile station 87 through the visitor location register 84 (S810) and requests paging to the corresponding public network base station 86 (S811).

The following process is performed in the same manner as call processing in the public network (S812-S819), and this series of processes can be performed only when the call originating mobile station 81 is willing to accept a toll call. Otherwise, the call ends as soon as a message is received from the call originating mobile station 81 regarding the rejection of the pay call transmission (S807).

After the call process is performed, since the information of the subscriber mobile station deviated from the database of the private wireless network base station is deleted, the subscriber mobile station can normally receive call processing from the next call.

When receiving a call request from the mobile station of the public network, since the private network base station only plays the role of a small base station, the call processing process may be performed in the same manner as the call processing process in the existing public network.

On the other hand, a call may be received from the public network during a local call in the private network base station service area. In this case, the private network base station may not respond to the paging failure. Repeated calls may be made repeatedly, but this is not a problem because the call originating mobile station will be forwarded by the public network and the call originating mobile station will stop transmitting. However, for the sake of complete service, create a section that provides a cause of failure to inform the mobile exchange that a local call is in progress, or further, call the mobile exchange when setting up a call at the private network base station. It is desirable to design the mobile exchange so that the mobile exchange can handle the call and inform the idle state when the call is terminated.

As described in detail above, according to the mobile station location registration method for the operation of the private network base station in the cellular system according to the present invention, while solving all the problems occurring in the operation of the private network base station in the existing cellular system, It is possible to construct a new private network base station that enables the provision of a new specific service to the current system without making any adjustments (deleting any adjustments) to the public network system. Compared with the existing public network base station, only a part of the system parameter is modified, and the implementation method is very easy by applying a given parameter according to the situation of each mobile station.

Claims (4)

A method of registering a location of a mobile station in a private network base station when operating a private network base station as part of a mobile communication system, A first step of broadcasting by adjusting a registration period parameter value in a system parameter message of a page channel of the private network base station relatively smaller than that of a public network base station; A second step of determining whether to be a subscriber based on preset subscriber information when receiving a registration or termination request message from any mobile station; And And a third step of responding after registration or termination by the subscriber as a result of the determination, and responding without registration or termination by the non-subscriber. The method of claim 1, Calculating a time according to the registration period for each registered subscriber; And if there is a subscriber that has passed the registration period as a result of the calculation, transmitting a registration request command to the corresponding mobile subscriber station, and if there is no response, deleting the location information of the corresponding subscriber. A mobile station location registration method for operating a private network base station in a system. The method of claim 1, If the message is registered when the power is turned on by examining the registration type field of the received registration request message, the location registration information of the mobile station is provided to the visitor location register or home location register of the public network system, and the visitor location register or home is registered. And updating the location registration information of the mobile station pre-registered with the location register. The method of claim 1, If the message is registered when the power is turned off by examining the registration type field of the received revocation request message, the location registration information of the mobile station is provided to the visitor location register or home location register of the public network system, and the visitor location register or home. And updating the location registration information of the mobile station pre-registered with the location register.