KR20020034043A - Location area operating method of mobile subscriber - Google Patents

Abstract

PURPOSE: A method for operating a mobile subscriber's location coverage is provided to prevent location updating and paging from being unnecessarily generated by determining the size of each subscriber's location coverage according to each subscriber moving pattern and traffic, allocating the location coverage of each determined size to each subscriber, and carrying out location updating. CONSTITUTION: A mobile station stores cell coverage, a mobile subscriber has visited, in a visit list and activates each timer allocated each stored cell coverage(S1). If the mobile subscriber moves to a cell coverage(S2), the mobile station confirms whether the cell coverage exists in the visit list(S3). In case that the cell coverage that the mobile subscriber moves to at present exists in the visit list, the mobile station do not carry out location updating(S4). However, if the cell coverage that the mobile subscriber moves to at present does not exist in the visit list, the mobile station adds the new cell coverage to the visit list and executes location updating to this new cell coverage(S5).

Description

How to operate location area of mobile subscriber {LOCATION AREA OPERATING METHOD OF MOBILE SUBSCRIBER}

The present invention relates to a method of operating a location area of a mobile subscriber. In particular, the mobile station of the mobile communication system allocates a location area of which size is determined according to the type and traffic of each mobile subscriber to the mobile subscribers to perform location update. The present invention relates to a method for operating a location area of a mobile subscriber to prevent the occurrence of renewal and paging.

Generally, the mobile communication system includes a mobile station 10, a base station 20 for wirelessly transmitting and receiving data with the mobile station 10 and controlling data wireless transmission and reception with the mobile station 10, and A control station 30 and an exchange station 40 for transmitting and receiving data to and from the base station 20 and controlling data transmission and reception with the base station 20, and a VLR (Visitor Location) for correcting mobility of a mobile subscriber and managing data of the subscriber. And a Home Location Register (HLR) 50.

The VLR 41 is configured in the switching center 40, and keeps the mobile subscriber's data only for the period in which the subscriber is in its system area and deletes the subscriber's data when moving to another area. Keep track of whether there are mobile subscribers on.

The HLR 50 stores the mobile subscriber's mobility information and additional service information to provide various additional service information along with guaranteeing mobility of the mobile subscriber's roaming.

One of the biggest features of the mobile communication system configured as described above is to ensure the mobility of the mobile subscriber, and techniques for ensuring the mobility of the mobile subscriber include location registration technology and handoff technology.

The location registration technology reports various mobile station information such as the location and state of the area where the mobile station 10 is located to the base station 20, and the base station 20 bases the mobile station 10 on the basis of the information of the mobile station 10. We want to make paging more effective.

Meanwhile, in the method of operating a location area of a conventional mobile subscriber according to the location registration technique, as shown in FIG. 2, the mobile station 10 of the conventional mobile communication system allocates a location area of the same size to all mobile subscribers. In this case, the location update process of each of the mobile stations 1, 2, 3, and 4 can be seen through FIG.

That is, the mobile station 10 determines a fixed sized location area at the initial setting of the system, and performs location update unconditionally when any mobile subscriber is out of the boundary of the determined location area.

However, the conventional method of operating the location area of the mobile subscriber does not consider the movement type and traffic of each mobile subscriber at all, and determines a fixed sized location area at the initial setting of the system so that any mobile subscriber can determine the location area. If the location update is performed unconditionally as long as it leaves the boundary of the location area of fixed size, there is a problem of causing unnecessary location update and paging.

As described above, there is a problem in that the total cost is increased due to paging performed unconditionally regardless of unnecessary location update and movement range of all mobile subscribers.

At this time, by allocating and using a fixed size location area determined at the time of initial setting of the system, as shown in FIG. 3, the burden due to the location update is concentrated only on cells at edges of the location area.

That is, the position update must be generated unconditionally as long as it is out of the boundary of the fixed-size position region determined at the initial setting of the system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to determine the size of the location area for each mobile subscriber according to the movement type and traffic of each mobile subscriber in the mobile communication system, and the determined size for each mobile subscriber. The present invention provides a method for operating a location area of a mobile subscriber to allocate location areas of the mobile station to prevent location update and paging, thereby reducing actual location update and paging costs.

1 is a block diagram of a general mobile communication system;

2 is a view showing a location area according to a conventional method for operating a location area of a mobile subscriber;

3 is a view illustrating a location update occurrence area according to a conventional method of operating a location area of a mobile subscriber;

4 is a view showing a location area of a mobile subscriber according to a method for operating a location area of a mobile subscriber according to the present invention;

5 is a flowchart illustrating a method for operating a location area of a mobile subscriber according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: mobile station 20: base station

30 control station 40 exchange station

41: VLR50: HLR

According to the method of operating a location area of a mobile subscriber of the present invention for achieving the above object, the mobile station stores a cell area visited by the mobile subscriber in a visit list (S), one for each cell area stored in the visit list (S). An initialization step of activating the provided timer T, and when the mobile subscriber moves the cell area after the initialization step, the mobile station moves to the visited list S or is a cell area where the mobile subscriber moves. A visit list (S) confirming step of confirming whether it is a new cell region that does not exist in (S) and a cell region moved by the mobile subscriber exist in the visit list (S) as a result of confirming the visit list (S) checking step. In the case of the cell area of the mobile station, the mobile station does not perform the location update, and as a result of the step of confirming the visit list (S), the mobile station moves by the mobile subscriber. If the station is a new cell area that does not exist in the visit list S, the mobile station adds a new cell area to the visit list S, and performs a location update generation step of performing a location update to the new cell area. do.

Hereinafter, a method of operating a location area of a mobile subscriber according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a diagram illustrating a location area of a mobile subscriber according to a method for operating a location area of a mobile subscriber according to the present invention, wherein the size of the location area for each mobile subscriber (1, 2, 3, 4) is determined by the type of movement of each mobile subscriber. It is determined according to the traffic, and it can be seen that the location area for each mobile subscriber (1, 2, 3, 4) is composed of cells recently visited by the mobile subscriber (1, 2, 3, 4).

In fact, the mobility characteristics of mobile subscribers are related to various issues such as individual occupation, social status, surroundings, residential location, vehicle availability, household situation, traffic conditions, etc. That is not a problem.

On the other hand, the above characteristics may not be a property that looks the same in all the mobile subscribers or all the mobile subscribers of the movement.

That is, the mobility characteristics of the mobile subscriber may show more random cell visit characteristics in some cases, and in the case of a vacation such as a vacation, it may result in a visit of a completely different cell irrespective of the locality or repeatability shown by the mobile subscriber. It may be.

However, since each mobile subscriber shows a multiple visit form in which a specific cell is continuously visited, considering the mobile characteristics, if the mobile subscriber includes cells visited in the location area, the mobile subscribers are generated according to the movement of the mobile subscriber. One can observe the characteristic that most of the location updates are drastically reduced.

Accordingly, in the present invention, a mobile station in which mobile subscribers repeat only approximately the same area by allocating location areas of different sizes to each mobile subscriber and having a unique location area centered on cells actually visited by mobile subscribers. It is adapted to the pattern very well.

5 is a flowchart illustrating a method of operating a location area of a mobile subscriber according to the present invention. Referring to this, the method of operating a location area of a mobile subscriber according to the present invention will be described in detail as follows.

In order to carry out the present invention, a mobile station of a mobile communication system has a visit list S for storing a cell area visited by a mobile subscriber, and is provided one by one for each cell area stored in the visit list S. A timer T is used to increase the value every time the cell area moves.

Here, the visit list (S) represents the size of the location area for each mobile subscriber determined according to the movement type and traffic of each mobile subscriber.

First, in the initialization step S1, the mobile station stores the cell area visited by the mobile subscriber in the visit list S, and activates a timer T provided for each cell area stored in the visit list S.

After the initialization step S1, the mobile station moves to the cell area moving step S2. When the mobile subscriber moves the cell area in step S2, the mobile station moves to the visit list S checking step S3. In step S2, it is checked whether the cell area moved by the mobile subscriber is a cell area existing in the visited list S or a new cell area not present in the visited list S.

As a result of confirming the visited list (S) confirming step (S3), if the cell area to which the mobile subscriber has moved is a cell area existing in the visited list (S), the mobile station proceeds to a location update non-occurring step (S4). Do not perform location update.

At this time, in the location update non-occurring step (S4), the timer T of the corresponding cell area is deactivated, and the timer T of the remaining cell area is activated to set the timer T value of the cell area not visited by the mobile subscriber. Is increased.

As a result of confirming the visited list (S) confirming step (S3), if the cell area to which the mobile subscriber has moved is a new cell area not present in the visited list (S), the process proceeds to the location update generating step (S5), and the mobile station. The new cell region is added to the visit list S while the position update to this new cell region is performed.

At this time, in the location update generation step (S5), the timer T of the newly added cell area is deactivated, and the timer T of the remaining cell area is activated to thereby activate the timer T value of the cell area not visited by the mobile subscriber. Will increase.

If no further cell area can be added to the visit list S, the mobile station deletes the cell area having the greatest value of the timer T from the visit list S and is confirmed in step S3. Add a new cell area.

That is, since the value of the timer of the cell area that the mobile subscriber does not frequently visit increases, when the timer value expires to a predetermined maximum value, the visit list of the appropriate size is deleted by deleting the cell area from the visit list S of the mobile station. Keep S) at all times.

On the other hand, the exchange station of the mobile communication system only needs to manage the visit list S transmitted from the mobile station, and when an incoming call to any mobile station occurs, paging to the corresponding cell area most recently updated in the visit list S is generated. If there is no response, paging is performed to all cell areas stored in the visit list (S).

As described above, in the present invention, the mobile station stores the cell area visited by the mobile subscriber in the mobile station internal visit list (S), and performs a location update whenever the mobile station moves to a new cell area not included in the visit list (S). When a new cell area is added and the cell area marked with a visit is revisited, the location update is not performed.

As described above, the mobile station of the mobile communication system determines the size of the location area for each mobile subscriber, that is, the visit list, according to the movement type and traffic of each mobile subscriber, and allocates the location area of the determined size to each mobile subscriber. By performing the location update, it is possible to prevent the occurrence of unnecessary location update and paging, thereby reducing the actual location update cost and paging cost.

In other words, when repeatedly visiting a specific cell region, which is a mobile subscriber's actual mobile form, multiple times, it is not suitable for various mobile subscribers' movements and changes in urban environment. In addition, the location area is composed of indispensable cells on each mobile subscriber's moving path, thereby reducing the actual location update cost and the paging cost.

In addition, the distribution of the cell where the location update occurs can be expected to be divided into all the service area in a relatively uniform distribution unlike the prior art, and the costs to be considered in relation to the location tracking of the mobile subscriber can be improved. While reinvestment can be made to improve the control channel's functionality, it is possible to reduce the network-intensive load through the related signal processing or the drastic reduction of traffic.

This means that more efficient operation is possible in network load management and utilization of radio resources.

Claims (8)

An initialization step of the mobile station storing the cell area visited by the mobile subscriber in the visit list S, and operating a timer T provided for each cell area stored in the visit list S; If the mobile subscriber moves the cell area after the initializing step, the mobile station checks whether the cell area moved by the mobile subscriber is a cell area existing in the visited list S or a new cell area not present in the visited list S. Visiting step (S) to confirm the step, A location update non-occurrence step in which the mobile station does not perform location update when the cell area to which the mobile subscriber moves is a cell area present in the visit list S as a result of the checking of the visit list S; As a result of confirming the visiting list S, the mobile station adds a new cell region to the visiting list S when the cell region to which the mobile subscriber moves is a new cell region that does not exist in the visiting list S. And a location update generation step of performing a location update to the cell area. The method of claim 1, wherein the mobile station deactivates the timer T of the corresponding cell area and activates the timer T of the remaining cell areas in the step of no location update. The method of claim 1, wherein the mobile station deactivates the timer T of the newly added cell area and activates the timer T of the remaining cell areas in the location update generation step. . 4. The value of the timer T in the visit list S according to claim 1 or 3, in the case where the mobile station cannot add more cell areas to the visit list S in the location update generation step. A method of operating a location area of a mobile subscriber, wherein the largest cell area is deleted and a new cell area is added. The visited list (S) of an appropriate size according to claim 1, wherein if the value of a timer of a cell region not frequently visited by the mobile subscriber expires to a predetermined maximum value, the visited list (S) of an appropriate size is deleted by deleting the cell region from the visited list (S) of the mobile station. A method of operating a location area of a mobile subscriber, which is always maintained. The cell area according to claim 1, wherein the exchange station receives and manages the visit list S operated by the mobile station, and when the incoming call to any mobile station occurs at the exchange station, the most recently updated position in the visit list S. And paging to all cell areas stored in the visit list (S) if there is no response. The mobile subscriber according to claim 1, wherein the visit list (S) represents the size of the location area for each mobile subscriber, and the size of the location area for each mobile subscriber is determined according to the movement type and traffic of each mobile subscriber. How to operate the location area. 8. A method according to claim 1 or 7, wherein the location area for each mobile subscriber is comprised of cells recently visited by the mobile subscriber multiple times.