KR101251182B1 - Method for registration in mobile telecommunications system and therfor system - Google Patents

Abstract

The present invention relates to a location registration method in a mobile communication system and a system therefor. The method may further include storing the first location information of the first registration area in a location information list stored by the terminal when the terminal enters the first registration area, and the terminal is separated from the first registration area. Entering a second registration area, storing second location information of the second registration area in the location information list, starting the first timer for the first location information, and starting the first timer. Removing the first location information from the location information list when it expires, determining whether the current location information of the terminal is included in the location information list, and the current location information is not included in the location information list. If not, characterized in that it comprises the step of performing a location registration to the system according to the current location information. Thus, the present invention improves the incoming call success rate by accurately maintaining the location registration state of the terminal.

Cellular System, Location Registration, Registration Area, VLR

Description

Location registration method in mobile communication system and system therefor {METHOD FOR REGISTRATION IN MOBILE TELECOMMUNICATIONS SYSTEM AND THERFOR SYSTEM}

1 is a block diagram showing the configuration of a mobile communication system according to a preferred embodiment of the present invention.

2 is a view for explaining an operation when the terminal moves on the boundary of the registration area.

3 is a signaling flowchart related to location registration of a terminal when the terminal is located at the boundary of the registration area.

4 is a signaling flowchart illustrating an example of a location registration procedure of a terminal according to an embodiment of the present invention.

The present invention relates to a method for registering a location of a terminal in a mobile communication network in a mobile communication system and a system therefor.

In a cell-based mobile communication system that divides an entire service area into a plurality of cells and covers each of the cells with a base station, the location of the terminal is continuously maintained in order to successfully connect an incoming call to the mobile terminal. Manage. To this end, the terminal reports its location periodically or aperiodically to the mobile communication system. This operation is called location registration. In particular, the UE performs location registration when moving between registration zones (hereinafter, referred to as REG_ZONEs) that are typically configured to include a plurality of cells, or a timer that is predetermined within one registration zone (hereinafter referred to as ZONE_TIMER). Whenever is expired, location registration can be performed.

In the mobile communication system, location information indicating a registration state of a terminal is shared and managed between the system and the terminal. The system maintains the location information of the terminal for a certain time to determine where the terminal is located, and is used to deliver the incoming call through paging. At this time, when the terminal approaches the base station of the new location, the base station should perform a zone based registration to inform the status of the terminal.

On the other hand, when the terminal moves at the boundary of the registration areas and maintains the IDLE state for a predetermined time, the terminal may sequentially enter the two registration areas and store both of the registration areas in its own location information list. After that, even though the terminal is located in one of the registration areas, the system and the terminal remove the location information of the terminal. Then, even though the terminal exists in any one registration area, since the location information previously maintained by the terminal and the base station is removed, the base station normally processes the terminal in the corresponding registration area when processing paging for the terminal. It does not recognize, and thus the terminal does not receive the paging for the incoming call. In order to solve this case, the terminal needs to access the base station at the current location through system access. However, in the conventional case, there was a problem in that an incoming call could not be received unless the terminal attempted to make an outgoing call.

Therefore, the present invention, which was devised to solve the problems of the prior art operating as described above, and a method for accurately maintaining the position registration state of the terminal located at the boundary of the registration area in the position registration of the mobile communication system and To provide a system.

It is another object of the present invention to provide a method and system for improving the incoming call success rate of a terminal by accurately registering the location information of the terminal in the system.

According to a preferred embodiment of the present invention, in the method for registering a location in a mobile communication system, when a terminal enters a first registration area, first location information of the first registration area is stored in the location information list stored by the terminal. Storing the second location information of the second registration area by including the second location information in the location information list and storing the second location information in the location information list. Starting the first timer with respect to the first timer and removing the first location information from the location information list when the first timer expires, and determining whether the current location information of the terminal is included in the location information list. And if the current location information is not included in the location information list, performing location registration with the system according to the current location information. .

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According to another embodiment of the present invention, in a terminal performing location registration in a mobile communication system, when entering a first registration area, first location information of the first registration area is stored in a location information list stored by the terminal. When the terminal moves away from the first registration area and enters the second registration area, the second location information of the second registration area is included in the location information list and stored, and the first timer for the first location information is stored. A location information list manager for removing the first location information from the location information list and determining whether current location information of the terminal is included in the location information list when the first timer expires; If the location information is not included in the location information list location registration unit for performing a location registration to the system according to the current location information It includes.

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The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The main subject of the present invention described below is to provide location registration of a terminal in a mobile communication system, and in particular, to provide a method for matching the location registration state of a terminal located at the boundary of registration areas with the system.

1 is a block diagram showing a configuration of a mobile communication system according to a preferred embodiment of the present invention, which includes a mobile station (MS) 110, a base transceiver subsystem (BTS) 120, 122, and a base station controller. (Base Station Controller: BSC) 130, 132 consisting of 130, 132, Mobile Switching Center (MSC) 140, 142, Visitor Location Register (VLR) 150, 152 ), A Home Location Register (HLR) 160 is shown. In the following, only important nodes related to the operation according to the preferred embodiment of the present invention will be described in detail.

Referring to FIG. 1, the terminal 110 wirelessly connects to the BTSs 120 and 122, and the BSCs 130 and 132 manage the wireless connection and perform call control for the terminal 110. The MSCs 140 and 142 connect a call of the terminal 110 connected through the base stations 125 and 135 of the lower level to another terminal or another system of the lower level. In this case, the MSCs 140 and 142 refer to subscriber information of the terminal 110 stored in the VLRs 150 and 152 to connect the call of the terminal 110. The HLR 160 manages the subscriber information of the terminals subscribed to the mobile communication system, in particular, the terminal 110, and the MSC 140 connected to the base stations 125 and 135 covering the cell where the terminal 110 is located. In response to the request of 142, the subscriber information of the terminal 110 is provided to the VLRs 150 and 152 of the corresponding MSCs 140 and 142.

The subscriber information includes various types of authentication information necessary for servicing the terminal 110, and in particular, location information of the terminal 110. The terminal 110 periodically or aperiodically performs location registration so that the location information of the terminal 110 included in the subscriber information can be continuously updated.

The terminal 110 continuously manages the previous location information to determine whether to perform location registration in a new registration area. The terminal 110 manages the previous location information as follows.

1. Store and manage a certain number of previous location information as a location information list. As an example, the location information includes a system ID (SID), a network ID (NID), and a registration area (REG_ZONE) identifier.

2. A timer ZONE_TIMER is provided for the location information of each registration area so that the location information is maintained for a predetermined time set in the timer. The base station signals a ZONE_TIMER value as shown in Table 1 below to the terminal, and the terminal manages each location information using the same.

3. When the terminal accesses the system (Access), for example, only in case of location registration, call signal, etc., the location information list is managed and the ZONE_TIMER is managed.

4. ZONE_TIMER for location information management is started for all of the location information of at least one registration area which is not currently connected to the terminal and is previously connected.

5. When ZONE_TIMER expires, the location information is removed from the location information list.

ZOME_TIMER Value
(binary) Timer length
(Minutes) 000 One 001 2 010 5 011 10 100 20 101 30 110 45 111 60

The system manages location registration of the terminal 110 as follows.

1. When registering the location of the terminal 110, the HLR 160 checks whether the terminal 110 is normally authenticated.

2. In the VLRs 150 and 152, when the normal terminal 110 authenticated through the HLR 160 moves between cells, the MSCs 140 and 142 may check in which base station the terminal 110 is managed. The location information of the terminal 110 is stored. In order to manage location information of the terminal 110 stored in the VLRs 150 and 152, a timer (hereinafter referred to as VLR_TIMER) that operates separately from the timer ZONE_TIMER of the terminal 110 is used. That is, the VLRs 150 and 152 remove the stored location information of the terminal 110 when the corresponding VLR_TIMER expires. When there is an incoming call directed to the terminal 110, the base stations 125 and 135 transmit a paging message for each registration area to inform the terminal 110 that the incoming call exists.

In the mobile communication system operating as described above, when the terminal moves at the boundary of the registration areas, the location information of the terminal may be deleted from the system even though the terminal is actually present in the system.

For example, a case where the terminal is located at a boundary between REG_ZONE # 1 and REG_ZONE # 2 will be described. When the terminal moves to REG_ZONE # 2 after accessing the base station of REG_ZONE # 1, the terminal is registered in both REG_ZONE # 1 and # 2, and the timer for REG_ZONE # 1, that is, ZONE # 1_TIMER is started. Thereafter, if the terminal moves back to REG_ZONE # 1 before the ZONE # 1_TIMER expires, the terminal still has location information of REG_ZONE # 1 and thus does not perform location registration, and the terminal does not perform location registration or originating call. The timer in REG_ZONE # 1, that is, ZONE # 1_TIMER, remains in its previous state unless the system is accessed. That is, it continues to operate.

In this case, if the ZONE # 1_TIMER expires before the terminal accesses the system, REG_ZONE # 1 is removed from the location information list of the terminal, but the terminal still belongs to REG_ZONE # 1. Therefore, when the location information of the terminal is removed as the VLR_TIMER expires in the VLR of the base station belonging to REG_ZONE # 1, the terminal cannot receive a paging message from the base station. On the other hand, a similar problem may occur when the time of ZONE_TIMER is not longer than the time of VLR_TIMER, but the time of VLR_TIMER can be changed by the operator and thus does not cause a big problem.

An operation when the terminal moves on the boundary of the registration area will be described with reference to FIG. 2.

First, when the terminal 210 is located in the BS # 1 230 belonging to the REG_ZONE # 1 220 (A) In the VLR # 1 250 to which the BS # 1 230 is connected, the location information of the terminal 210 and Together, the subscriber information of the terminal 210 received from the HLR 260 is managed. From this point, the VLR # 1 250 starts and manages a timer for managing location information of the terminal 210, that is, VLR # 1_TIMER.

When the terminal 210 enters the BS # 2 232 belonging to the REG_ZONE # 2 222 (B) The terminal registers its location information in the VLR # 2 252 through the BS # 2 232. . At this time, the terminal 210 starts a timer for location information on the REG_ZONE # 1 220, that is, ZONE # 1_TIMER.

When the terminal 210 returns to the REG_ZONE # 1 220 again (C), since the terminal 210 still has the location information for the REG_ZONE # 1 220, the terminal 210 does not perform the location registration with the BS # 1 230. Do not. At this time, the ZONE # 1_TIMER of the REG_ZONE # 1 continues to operate in the terminal 210. When the ZONE # 1_TIMER expires, the terminal 210 removes the position information of the REG_ZONE # 1 from its location information list. In this case, if the terminal 210 removes the location information on the terminal 210 as the VLR # 1_TIMER expires in the VLR # 1 250 without performing the location registration again to the BS # 1 230, Since the terminal 210 is not registered in the REG_ZONE # 1 220, the terminal 210 receives a paging message for requesting an incoming call through the BS # 1 230 despite being located in the REG_ZONE # 1 220. Can not.

That is, in the situation as shown in FIG. 2, the reception is successful in the region A or the region B, but the reception is often failed in the region C belonging to the BS # 1230.

3 illustrates a signaling flow related to location registration of a terminal when the terminal is located at the boundary of the registration area.

Referring to FIG. 3, the terminal MS transmits a location registration message to BS # 1 belonging to REG_ZONE # 1 in step 302, and the location registration message is transmitted from BS # 1 to VLR # 1 in step 304. In step 306, the VLR # 1 stores the location information of the terminal in response to the location registration message and requests the subscriber information of the terminal from the HLR. When authentication of the terminal is completed and the subscriber information of the terminal is received from the HLR in step 308, the terminal is in a state capable of receiving an incoming call normally. At this time, VLR # 1_TIMER for the UE is started in VLR # 1.

In step 310, the UE moves to a cell of BS # 2 belonging to REG_ZONE # 2, accesses VLR # 2, and transmits a location registration message to BS # 2. At this time, the terminal adds the location information of REG_ZONE # 1 to its location information list and starts the timer for REG_ZONE # 1, that is, ZONE # 1_TIMER. In step 312, the location registration message is transferred from BS # 2 to VLR # 2, and in steps 314 and 316, VLR # 2 stores the location information of the terminal and requests the subscriber information of the terminal to the HLR. The location registration of the terminal is completed by storing.

If the terminal does not attempt to access the system (outgoing call or location registration, etc.), the ZONE # 1_TIMER continues to operate without being updated. In this situation, when the UE returns to the cell of BS # 1, the UE does not perform location registration to BS # 1 since REG_ZONE # 1 to which BS # 1 belongs already exists in its location information list in step 318. At this time, the terminal does not start ZONE # 2_TIMER. On the other hand, as the VLR # 1_TIMER managed by the VLR # 1 expires in step 320, the VLR # 1 removes the location information of the terminal. Therefore, the terminal is in a state where the location registration is not made.

Thereafter, when the ZONE # 1_TIMER for the REG_ZONE # 1 of the terminal expires in step 322, the terminal deletes the location information of the REG_ZONE # 1 from its location information list, but still registers the location to BS # 1 as shown in step 324. It doesn't work. This is because, after the location information of REG_ZONE # 1 is deleted, location registration events such as movement between registration areas or system access have not occurred.

In the above case, even if an incoming call request to the terminal is received by the BS # 1 in step 326, the VLR # 1 to which the BS # 1 belongs does not have the location information of the terminal. The paging is not transmitted to the terminal, and thus, the incoming call connection fails as shown in step 330.

Thereafter, if the terminal attempts to access the system including an outgoing call or location registration in step 332, the terminal performs location registration in BS # 1 in step 334, and the location information of the terminal according to the location registration in step 336 Transfer from BS # 1 to VLR # 1. At this time, the terminal includes REG_ZONE # 1 in its location information list and restarts ZONE # 2_TIMER for ZONE # 2. In steps 338 and 340, the VLR # 1 stores the location information of the terminal and requests and receives the subscriber information of the terminal from the HLR. Thus, in step 342, the terminal is in a state capable of receiving an incoming call normally.

As described above, when the terminal returns to the corresponding REG_ZONE before the ZONE_TIMER expires, the terminal is not registered until the terminal attempts to access the system, thereby failing to receive paging for an incoming call. Therefore, according to a preferred embodiment of the present invention, the terminal includes the current location information as well as the previous location information in its location information management. As another example, the current location information may be managed as a separate form, for example, a current location list, rather than a form included in the location information list. In this case, the current location list includes the SID, NID, and REG_ZONE ID of the current location, and the terminal compares the current location with the current location list when the ZONE_TIMER expires.

When the terminal moves in the boundary between REG_ZONEs, the ZONE_TIMER for managing the REG_ZONE expires and always compares its own location information list with the currently connected REG_ZONE, so that the currently connected REG_ZONE may not be included in the location information list. In this case, location registration should be performed at the current location. This prevents the problem that the actual location information of the terminal is removed from the VLR, so that the terminal can normally receive the paging message generated later.

4 is a signaling flowchart illustrating an example of a location registration procedure of a terminal according to an embodiment of the present invention.

Referring to FIG. 4, in step 402, the MS transmits a location registration message to BS # 1 belonging to a new registration area REG_ZONE # 1. In step 404, the location registration message is transmitted from BS # 1 to VLR # 1. Delivered. At this time, the terminal stores the current location information for BS # 1 of REG_ZONE # 1 in its location information list. In step 406, the VLR # 1 stores the location information of the terminal in response to the location registration message and requests the subscriber information of the terminal from the HLR. When authentication of the terminal is completed and the subscriber information of the terminal is received from the HLR in step 408, the terminal is in a state capable of receiving an incoming call normally. At this time, VLR # 1_TIMER for the UE is started in VLR # 1.

In step 410, the UE moves away from REG_ZONE # 1 to the cell of BS # 2 belonging to the new registration area REG_ZONE # 2, accesses VLR # 2, and transmits a location registration message to BS # 2. At this time, the terminal adds and stores current location information of BS # 2 of REG_ZONE # 2 to the location information list, and starts a timer for location information of REG_ZONE # 1 stored in its location information list, that is, ZONE # 1_TIMER. At this time, the timer for REG_ZONE # 2 is not started. In step 412, the location registration message is transferred from BS # 2 to VLR # 2, and in steps 414 and 416, VLR # 2 stores the location information of the terminal and then receives the subscriber information of the terminal to the HLR. The location registration of the terminal is completed by storing.

If the terminal does not attempt to access the system (outgoing call or location registration, etc.), the ZONE # 1_TIMER continues to operate without being updated. In this situation, when the UE returns to the cell of BS # 1, the UE does not perform location registration to BS # 1 because REG_ZONE # 1 to which BS # 1 belongs already exists in its location information list in step 418 and ZONE # 1_TIMER. Still continues operation. Meanwhile, as the VLR # 1_TIMER managed by the VLR # 1 expires in step 420, the VLR # 1 removes the location information of the terminal. Therefore, the terminal is in a state where the location registration is not made.

After the ZONE # 1_TIMER for the REG_ZONE # 1 of the terminal expires in step 422, the terminal deletes the location information of the REG_ZONE # 1 from its location information list, and proceeds to step 424 where the base station (BS # 1) is currently connected. It is determined whether the location information related to) exists in the location information list. That is, it is determined whether both the system identifier (SID), the network identifier (NID), and the registration area identifier (REG_ZONE ID) at the current location are present in the location information list.

If the current location information of the terminal exists in the location information list, the process proceeds to step 436 without performing location registration at the current location. In contrast, if the current location information of the terminal does not exist in the location information list, the terminal proceeds to step 426 and the terminal transmits a location registration message to BS # 1 currently connected. In step 428, the location registration message is transferred from BS # 1 to VLR # 1. Then, in steps 430 and 432, the VLR # 1 stores the location information of the terminal in response to the location registration message and requests and receives the subscriber information of the terminal from the HLR. As a result, the terminal is normally able to receive an incoming call.

Thereafter, when the incoming call request to the terminal is received from the BS # 1 in step 434, the BS # 1 transmits a paging message for requesting the incoming call to the mobile station in step 436. After answering the message, the incoming call connection is successful.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention has the effect of improving the reception success rate of the incoming call by ensuring that the location registration state of the terminal is correctly maintained in the mobile communication system.

Claims (10)

In the location registration method in a mobile communication system, When the terminal enters a first registration area, storing first location information of the first registration area in a location information list stored by the terminal; When the terminal exits from the first registration area and enters the second registration area, the second location information of the second registration area is included in the location information list and stored, and the first timer for the first location information is stored. The process of starting up, Removing the first location information from the location information list when the first timer expires, and determining whether current location information of the terminal is included in the location information list; And if the current location information is not included in the location information list, performing location registration with a system according to the current location information. The method of claim 1, wherein each of the first and second location information, And at least one of a system identifier (SID), a network identifier (NID), and a registration area identifier. The method of claim 1, wherein the determining is performed. And determining that the current location information is included in the location information list when a system identifier, a network identifier, and a registration area identifier are included in the location information list. 2. The method of claim 1, wherein the timer value of the first timer is signaled from a base station. In the terminal performing location registration in the mobile communication system, When entering the first registration area, the first location information of the first registration area is stored in the location information list stored by the terminal, and when the terminal is moved away from the first registration area to enter the second registration area Storing the second location information of the second registration area in the location information list, starting the first timer for the first location information, and when the first timer expires, the first location in the location information list. A location information list manager to remove information and determine whether current location information of the terminal is included in the location information list; If the current location information is not included in the location information list terminal comprising a location registration unit for performing a location registration to the system according to the current location information. 6. The method of claim 5, Each of the first and second location information, And at least one of a system identifier (SID), a network identifier (NID), and a registration area identifier. 6. The method of claim 5, The location information list management unit, And when a system identifier, a network identifier, and an identifier of a registration area of the terminal are currently included in the location information list, determining that the current location information is included in the location information list. 6. The method of claim 5, The timer value of the first timer is Terminal signaled from the base station. The method of claim 1, The current location information, And reentering the first registration area of the terminal, wherein the location information is the first location information. 6. The method of claim 5, The current location information, And reentering the first registration area of the terminal, wherein the terminal is the first location information.

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