JP5885211B2 - Mobile communication terminal location management system and method - Google Patents

Description

  The present invention relates to a mobile core network control system that manages a plurality of mobile communication terminals and radio base stations, manages connection positions of mobile communication terminals, and enables terminal calls at all times, and in particular, mobile core network mobility management. The present invention relates to a mobile communication terminal location management system including a control device and a subscriber database device, and managing a connection location of a mobile communication terminal and a method thereof.

A method for constantly managing the connection position of a mobile communication terminal that is constantly moving in a mobile core network control system has been known. (Non-patent document 1: 3GPP TS 23.401)
FIG. 5 shows a configuration diagram of a conventional mobile communication terminal location management system. As shown in the figure, a plurality of radio base station controllers 13 are connected to a single mobility management controller (MME) 14, and a plurality of radio base stations 12 are connected to each radio base station controller 13. Yes. The mobility management control device (MME) 14 is connected to a subscriber information database device (HSS) 15.

  The mobility management control device 14 includes a location management function 16 that tracks the location of the wireless terminal (mobile communication terminal) 11 and a terminal call function (paging function) 17 that calls the wireless terminal 11 when an incoming call is received.

  In the conventional mobile communication terminal location management system configured as described above, as shown in FIG. 6, when the wireless terminal (mobile communication terminal) 11 is started or when the wireless terminal 11 returns from outside the wireless access area, the mobile network selection is performed. And cell selection, and start the connection procedure to the mobile core network.

  First, the wireless terminal 11 connects to the wireless base station 12 (SA1), and transmits a connection request to the wireless base station control device (eNodeB) 13 (SA2). The radio base station controller (eNodeB) 13 transmits a connection request for the radio terminal 11 to the mobility management controller (MME) 14 (SA3). The mobility management control device (MME) 14 sends a location registration request to the subscriber information database (HSS) 15 together with the ID of the device 14 and the user ID of the terminal user, and the subscriber information database (HSS) 15 Is stored (SA4).

  The subscriber information database device (HSS) 15 transmits the user's subscription contract information to the mobility management control device (MME) 14 (SA5). When the mobility management control device (MME) 14 receives this, the mobility management control device (MME) 14 manages the connection position of the wireless terminal 11 and the wireless terminal 11 is connected. ID list (location management area ID list) of a plurality of cells including this cell is transmitted to the radio base station controller (eNodeB) 13 (SA6). Finally, the radio base station control device (eNodeB) 13 permits the radio connection by the radio terminal 11 via the radio base station 12, and the mobility management control device ID, the location management terminal ID, and the location management are given to the radio terminal 11. The area ID list is notified (SA7, SA8).

  The wireless terminal 11 that has been registered once moves and enters a new location management area, or performs a location registration update procedure when periodic location registration update is required without moving. The flow of this process will be described below with reference to FIG.

  When the wireless terminal 11 moves from a cell that has been in the area to a cell outside the cell indicated in the pre-assigned location management area list, the wireless terminal 11 performs location registration with the mobile core network again. .

  First, the wireless terminal 11 transmits a location registration update request to the network using the location management terminal ID assigned in the location management area before movement (SB1, SB2). The location registration update request transmitted from the wireless terminal 11 is transmitted to the wireless base station controller (eNodeB) 13 via the wireless base station 12. Upon receiving this location registration update request, the radio base station controller (eNodeB) 13 responds to the new mobility management controller (MME) 14B that manages the new cell of the destination where the radio terminal 11 is currently located. The location registration of the location management terminal ID is performed (SB3). The new mobility management control device (MME) 14B manages the cell that was in the area before the wireless terminal 11 moved to the current cell based on the location management terminal ID. 14A is specified, and the user ID of the wireless terminal 11 of the location registration update request source is inquired using the same ID (SB4). The old mobility management control device (MME) 14A identifies the location registration update request source user ID from the location management terminal ID and transmits it to the new mobility management control device (MME) 14B (SB5). The new mobility management control device (MME) 14B registers the user ID and the ID of the new mobility management control device (MME) 14B in the subscriber database device (HSS) 15 (SB6, SB7).

  The new mobility management control device (MME) 14B assigns a new location management terminal ID and location tracking area ID list to the location registration update request source wireless terminal 11, and sends it to the radio base station control device (eNodeB) 13. Transmit (SB8). The radio base station controller (eNodeB) 13 transmits this to the radio terminal 11 and responds with the location registration update result (SB9, SB10).

  Also, as shown in FIG. 8, in the prior art, once the wireless terminal 11 that has registered its location does not transmit / receive packets, does not move across cells, and does not update location registration, it also periodically A location registration update procedure is performed for the mobility management control device (MME) 14 of the mobile core network. That is, in the current mobile core network, regardless of the movement amount (movement frequency, speed) of the wireless terminal 11, fixed-size position tracking areas (TA) TA # 1 and TA # 2 are allocated, and the wireless terminal 11 Even if the area is not changed by the movement of 11, the location registration is performed periodically. The interval time for this update procedure is defined as 54 minutes, for example, in the prior art. In the figure, the location registration update procedure is performed after the initial, X minutes, 2X minutes, and 3X minutes. Here, the mobility management control device (MME) 14 manages the cell in which the wireless terminal 11 is located for each location tracking area, and the subscriber database device (HSS) 15 manages the cell in which the wireless terminal 11 is located. The mobile management control device (MME) 14 is managed.

  Regarding the location registration update process, when the wireless terminal A registers that the wireless terminal A is in the cell under the location tracking area TA # 1 in the initial location registration, the location tracking is performed in LTE to reduce the location registration signal. The area TA # 2 also manages the position so that the wireless terminal A can be connected. For this reason, control is performed such that location registration is not required when the wireless terminal moves to the location tracking area TA # 2, and location tracking is performed using the location tracking areas TA # 1 and TA # 2 as paging ranges when the terminal is called (paging). A paging signal is transmitted to the entire cells in areas TA # 1 and TA # 2. In this control, the allocated cell is determined regardless of the movement amount of the current wireless terminal, and adjustment according to the movement amount is not performed.

  Further, in the prior art, a location tracking area (TA: Tracking Area) TA # 1, TA # 2 composed of a plurality of cells, and a paging area (PA: Paging) that defines a range in which the wireless terminal 11 is called when an incoming call is received from the network side. The movement of the wireless terminal 11 is managed by (Area).

  A paging area can be composed of a plurality of location tracking areas, and even if a wireless terminal is located in the same area as shown in FIG. 9, it can be moved by assigning a different paging area to each wireless terminal. The load distribution of the location registration signal processing in the management control device (MME) 14 is attempted. Also, when assigning different paging areas for each wireless terminal, the number of tracking areas to be assigned can be changed.

  That is, FIG. 9 shows the relationship between the paging area PA, the position tracking area TA, and the cells assigned to each wireless terminal. Normally, the position tracking area TA is composed of a plurality of cells, and the paging area PA is composed of a plurality of position tracking areas TA. At this time, if there are two wireless terminals 1 and 2 and the wireless terminal 1 is located in the location tracking area TA # 1 and TA # 2, the location tracking area TA # 1 and TA as the paging area PA. # 2 is assigned, and paging is performed for TA # 1 and TA # 2. When the wireless terminal 1 moves to a cell under the position tracking area TA # 3, a new paging area PA is allocated, and here, only the position tracking area TA # 3 is paged. This allocation of the paging area PA can be changed for each wireless terminal. When the wireless terminal 2 is located in the position tracking area TA # 1, only the position tracking area TA # 1 is allocated as the paging area PA, When located in the position tracking areas TA # 2 and TA # 3, the position tracking areas TA # 2 and TA # 3 can be assigned as the paging area PA.

  However, a reduction in the number of signals necessary for the location management processing of the mobility management control device MME is an issue.

  The above-described conventional mobile communication terminal location management system requires periodic location registration update and terminal call to a wide area even for wireless terminals that do not move or wireless terminals with low communication frequency. For example, when realizing an M2M service where an explosive increase in the number of wireless terminals is assumed, it is clear that mobility management resource consumption in the mobility management control device (MME) and shortage of radio frequency resources at the time of terminal call are caused.

  For this reason, in order to efficiently accommodate wireless terminals with a narrow movement range and low communication frequency, the size of the paging area allocated to the wireless terminal 11 and the location registration update frequency are set as the movement characteristics of the wireless terminal 11 as shown in FIG. For the purpose of optimizing according to (frequency, speed), etc., as shown in (Patent Document 1: Japanese Patent Laid-Open No. 2008-193592), the size of the paging area is optimized according to the amount of movement of the terminal. The technology to make it is proposed. In other words, proposals have been made to perform mobility management optimization (minimization of paging processing load by optimization of allocation area, extension of location registration update interval) of the wireless terminal 11 with low mobility frequency.

  The system shown in FIG. 10 changes the location registration update interval according to the amount of movement of the wireless terminal or assigns the assigned paging for the location registration update operation of the wireless terminal described in FIG. 8 and the allocation of the paging area PA in FIG. Change the size of the area.

  A wireless terminal with a small amount of movement (movement speed, range) does not change its state even if periodic location registration update is performed, so the location registration update interval is set longer than usual to reduce the number of times of processing. In addition, the optimization of the allocated paging area is that a plurality of location tracking areas TA are allocated as normal paging areas PA, but the number of location tracking areas TA is reduced to one or only specific cells in the location tracking area TA are allocated. This means that control is assigned.

JP 2008-193592 A

3GPP TS 23.401

  However, as shown in FIG. 11, the existing technology can optimize the paging area size and location registration update interval for a wireless terminal under a single mobility management control device (MME). In cases where the mobility management control device (MME) that manages the location is switched, the optimized mobility management parameters (paging area size, location registration update interval) may be transferred to another mobility management control device (MME). Can not. For this reason, another mobility management control device (MME) needs to perform the optimization procedure again, and the resources of the mobility management control device (MME) cannot be made efficient.

  In FIG. 11, one of the mobility management control devices (MME1) is optimized so that the wireless terminal A of the low mobility service has TA / 3 as the paging area size (1/3 of the size of the normal location tracking area TA). ) Is assigned and 5X (5 times the normal update interval X) is set as the location registration update interval. The wireless terminal B of the high mobility service is assigned 3TA as the paging area size (three times the size of the normal location tracking area TA) and X / 3 (1/3 of the normal update interval X) is set as the location registration update interval. Has been. Further, TA / 3 (1/3 of the size of the normal position tracking area TA) is assigned to the wireless terminal C for normal service, and 5X (5 times the normal update interval X) is assigned as the position registration update interval. Is set. In FIG. 11, since three cells are assigned to one position tracking area TA, TA / 3 means one cell.

  However, when the wireless terminal moves to an area managed by another mobility management control device (MME2), the paging area size and the location registration update interval assigned to each wireless terminal are initialized.

  In other words, the existing technology is a technology for optimizing the mobility management parameters (assigned paging area size, location registration update interval) of wireless terminals within the same mobility management control device (MME). ) Mobility management parameters cannot be taken over.

  Therefore, in the existing technology, at the time of starting the wireless terminal, if the mobility management control device (MME) that accommodates the wireless terminal changes due to the movement of the wireless terminal or the accommodation change of the mobility management control device (MME), The challenge is to be able to take over optimal mobility management parameters based on the service type of the wireless terminal.

  In view of the above-described problems, an object of the present invention is to provide a mobile communication terminal location management system and method that can use the same mobility management parameters by taking over even if the mobility management control apparatus that accommodates the mobile communication terminal changes. It is.

  A further object of the present invention is to provide a mobile communication terminal location management system and method that can reduce the location management processing load of the mobility management control device in view of the above problems.

  In order to achieve the above object, the present invention accommodates a mobile communication terminal, holds a mobility management parameter of the mobile communication terminal, and based on an allocated paging area size and a location registration update interval included in the mobility management parameter. A plurality of mobility management control devices for managing the location of the mobile communication terminal, and a subscriber database device connected to the plurality of mobility management control devices, and using the mobility management parameter, In the mobile communication terminal location management system that enables terminal calling, the mobile management terminal is connected to the plurality of mobility management control devices, and holds the mobility management parameters optimized by the mobility management control device for each mobile communication terminal, Providing a mobility management parameter management server capable of providing the mobility management parameter to the mobility management control device; According to the service type of the mobile communication terminal in the mobile management control device, the location management optimization parameter defining the implementation range of the optimization process of the mobility management parameter of the mobile communication terminal is stored and the location management optimization parameter is A location management optimization parameter storage unit provided to the mobility management control device is provided in the subscriber database device, and mobility management parameters of mobile communication terminals to be accommodated in the mobility management control device are registered in the mobility management parameter management server. A function for obtaining the registered mobility management parameter, a function for obtaining the location management optimization parameter from the location management optimization parameter storage unit, and the obtained location management optimization parameter, A function for optimizing the mobility management parameters of the mobile communication terminals to be accommodated, and the optimization The mobility management parameter Suggest mobile communication terminal location management system characterized by comprising a function of registering the mobility management parameter management server.

  Further, in order to achieve the above object, in the mobile communication terminal location management system, the mobility management parameter is the location registration update indicating a time interval at which the mobile communication terminal transmits a signal notifying its own location. The mobility management control device includes information on the mobile communication terminal corresponding to the mobility management parameter when the location registration update interval in the mobility management parameter exceeds a predetermined value. A mobile communication terminal location management system having a function of registering and stopping location management processing for the mobile communication terminal is proposed.

  In order to achieve the above object, the present invention accommodates a mobile communication terminal, holds the mobility management parameter of the mobile communication terminal, and includes an allocated paging area size and a location registration update interval included in the mobility management parameter, And a subscriber database device connected to the plurality of mobility management control devices, and using the mobility management parameter, the mobile communication terminal. In the mobile communication terminal location management method that enables a continuous terminal call, the mobile management terminal is connected to the plurality of mobility management control devices and holds the mobility management parameters optimized by the mobility management control device for each mobile communication terminal And providing a mobility management parameter management server capable of providing the mobility management parameter to the mobility management control device. In accordance with the service type of the mobile communication terminal in the mobile management control device, the location management optimization parameter that defines the implementation range of the optimization process of the mobility management parameter of the mobile communication terminal is stored and the location management optimization parameter is A location management optimization parameter storage unit to be provided to the mobility management control device is provided in the subscriber database device, and the mobility management control device stores the mobility management parameters of the mobile communication terminals to be accommodated in the mobility management parameter management server. The registered mobility management parameter is acquired, the location management optimization parameter is acquired from the location management optimization parameter storage unit, and the mobile communication is accommodated based on the acquired location management optimization parameter. Optimize the mobility management parameters of the terminal and change the optimized mobility management parameters Suggest mobile communication terminal location management method and registers the serial mobility management parameter management server.

  Further, in order to achieve the above object, in the mobile communication terminal location management method, the mobility management parameter includes the location registration update indicating a time interval at which the mobile communication terminal transmits a signal notifying its own location. The mobility management control device includes information on the mobile communication terminal corresponding to the mobility management parameter when the location registration update interval in the mobility management parameter exceeds a predetermined value. A mobile communication terminal location management method for registering and stopping location management processing for the mobile communication terminal is proposed.

  According to the mobile communication terminal location management system and method of the present invention, each mobility management control device can exchange the mobility management parameters of the mobile communication terminal via the mobility management parameter management server. Even if the mobility management control device to be accommodated changes, each mobility management control device can take over and use the same mobility management parameter.

  Furthermore, according to the mobile communication terminal location management system and method of the present invention, the location management processing of the mobile communication terminal whose location registration update interval has increased is transferred from the mobility management control device to the subscriber database device. It is possible to reduce the position management processing load of the control device.

The block diagram which shows the mobile communication terminal location management system in one Embodiment of this invention The figure which shows the outline of a structure of the mobile communication terminal location management system in this embodiment, and the flow of a process. The figure explaining the application of this invention and a movement management parameter when a macro cell and a small cell are superimposed and arranged by HetNet environment The figure explaining the position management process with respect to the radio | wireless terminal with little movement amount in this embodiment Configuration diagram showing a conventional mobile communication terminal location management system The figure explaining the location registration procedure in a prior art example The figure explaining the location registration update procedure in a prior art example The figure explaining the outline of the mobility management technology in the conventional example The figure explaining allocation of the paging area and position tracking area for every radio | wireless terminal in a prior art example The figure explaining the position management optimization technique in a prior art example The figure explaining the subject in a prior art example

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram showing a mobile communication terminal location management system in the present embodiment. In the figure, the same components as those described above are denoted by the same reference numerals, and the description thereof is omitted. The differences between the conventional example and this embodiment are the following (1) and (2).

  (1) A location management optimization parameter 21 corresponding to the service type of each wireless terminal (mobile communication terminal) 11 in the mobility management control device (MME) 14 is defined in the subscriber database device (HSS) 15, and the wireless terminal Defined the scope of optimization processing according to 11 service types.

  (2) The mobility management parameters including the size of the paging area and the location registration update interval optimized by a specific mobility management control device (MME) 14 are retained and optimized between the mobility management control devices (MME) 14. A mobility management parameter management server 22 that can take over the mobility management parameters is provided in the subscriber database device (HSS) 15.

  Thereby, the mobile communication terminal location management system of this embodiment can continue location management using the optimized mobility management parameter even when the mobility management control device (MME) that accommodates the wireless terminal 11 is changed. And

  In this embodiment, the mobility management parameter management server 22 is provided in the subscriber database device (HSS) 15. However, the present invention is not limited to this, and each mobility management is performed inside the mobile network as a new device. You may deploy in the form connected to a control apparatus (MME).

  FIG. 2 shows an outline of the configuration and processing flow of the mobile communication terminal location management system in the present embodiment.

  In this embodiment, as described above, first, the location management optimization parameter storage unit 21 of the subscriber database device (HSS) 15 is configured so that the mobility management parameters can be exchanged between different mobility management control devices (MME). The location management optimization parameters are defined and registered. This optimization parameter is determined by the operator according to the service type of each wireless terminal. In addition, the optimization parameters include the area size enlargement / reduction rate and the update interval reduction / extension rate determined according to the service type of the wireless terminal, and this optimization parameter is not only for mobile phones used by people, It is also applied to M2M (Machine-to-Machine) terminals. Since the M2M terminal has a wide range of movement frequencies and ranges from cars to smart meters, the position management optimization parameter is determined in advance according to the type of M2M service, and the position management optimization parameter storage unit 21 of the subscriber database device (HSS) 15 is used. Register with.

  The area size enlargement / reduction ratio is for adjusting the paging area size in the movement management parameter, and the update interval reduction / extension ratio is for adjusting the position registration update interval in the movement management parameter.

  In the location management optimization parameter shown in FIG. 2, the area size enlargement / reduction rate of the wireless terminal A of the low mobility service is set to 0.5, and the update interval reduction / extension rate is set to 1.5. In addition, the area size enlargement / reduction rate of the wireless terminal B of the high mobility service is set to 1.2, and the update interval reduction / extension rate is set to 0.8. In addition, the area size enlargement / reduction ratio of the wireless terminal C of the normal motion service is set to 1, and the update interval reduction extension ratio is set to 1.

  The optimization processing regulations according to the wireless terminal service type are determined by the operator or the service providing party to determine the value assumed by the service using the mobile phone or the M2M module, and the location management of the subscriber database device (HSS) 15 is performed. It is registered in the optimization parameter storage unit 21 in advance.

  Secondly, the subscriber database device (HSS) 15 has a common mobility management parameter management server 22 among the mobility management control devices (MME), and the mobility management control device (MME) and the mobility management parameter management server 22 An interface for connecting the two is provided.

  As a result, after the wireless terminal performs location registration with the first mobility management control device (MME1), the first mobility management control device (MME1) acquires the optimization parameter 21 from the subscriber database device (HSS) 15. Then, using this optimization parameter 21, the mobility management parameters (eg, paging area size and location registration update interval) of the wireless terminal are optimized, and the optimized mobility management parameters are used as the subscriber database device (HSS) 15. Are registered in the mobility management parameter management server 22. Accordingly, when the wireless terminal moves from the cell managed by the first mobility management control device (MME1) to the cell managed by the other mobility management control device (MME), the other mobility management control device (MME) moves. It is possible to acquire and apply the movement management parameters after being adjusted by accessing the management parameter management server 22. Further, the optimization parameter 21 is acquired from the subscriber database device (HSS) 15 in the other mobility management control device (MME), and the mobility management parameter of the wireless terminal is optimized using the optimization parameter 21. Can do.

  For example, the area managed by the second mobility management control device (MME2) after the mobility management parameters in the first mobility management control device (MME1) managing the cell where the wireless terminal is located are optimized. When the wireless terminal is accommodated, the second mobility management control device (MME2) manages the cell in which the wireless terminal was previously located based on the ID information of the wireless terminal from the mobility management parameter management server 22. The mobility management parameter optimized by one mobility management control device (MME1) is acquired, applied to the mobility management control in the second mobility management control device (MME2), and the optimization is continued as necessary.

  Further, the optimization parameter is different for each service type for the following reason.

  That is, the low mobility service refers to a wireless terminal that is fixed and does not move, such as a vending machine or a smart meter. Such wireless terminals do not move, or even if they are present, the frequency is very low, so it is possible to narrow down the area, so the area expansion rate is reduced and the time in the area is long Make the paging area smaller. In addition, since the update interval is low and the communication frequency is low, it is not necessary to constantly monitor the position and state of the wireless terminal even if the frequency of the location registration update process is reduced. Control it to grow rapidly during the period of service. For this reason, the update interval reduction / extension rate is increasing.

  On the other hand, the high mobility service assumes wireless terminals such as buses and taxis that are constantly moving, and it is often necessary to keep the area wide. For this reason, the area enlargement ratio is set high, and control is performed so that the paging area PA is quickly increased from the initial value. Similarly, when it is necessary to constantly monitor the connection state in order to avoid disconnection, it is necessary to set the location registration update interval short. For this reason, control is performed such that the extension rate of the location registration update interval is reduced and the location registration update interval is quickly shortened during the period of stay.

  FIG. 3 is a diagram illustrating application of the present invention and mobility management parameters when macro cells and small cells are arranged in a superimposed manner in a HetNet environment. In this case, by changing the output of the macro cell, even when the arrangement relationship between the small cell and the macro cell is changed, the information on the small cell where the wireless terminal is located can be taken over without new signal transmission.

  That is, when small cells become widespread, it is necessary to manage a set of C-plane macro cells and U-plane small cells on the mobility management control device (MME) side.

  The management here refers to performing C-plane communication using a macro cell and U-plane communication using a small cell. Although management of this allocation has not yet been determined by the standard specification, it is presumed that the mobility management control device (MME) or the radio base station control device (eNodeB) will carry out.

  When managing a set of macro cells and small cells as described above, the macro cell in which the wireless terminal is located is updated by the location registration signal, but the means for updating the located small cell is currently unclear. That is, since a small cell does not handle a control signal (C-plane), at present, a method for registering information on which small cell a wireless terminal is located in a mobility management control device (MME) is not defined. Because.

  However, when the relationship between the macro cell and the small cell changes due to output adjustment on the macro cell side, etc., this technology can be used to identify the small cell in which the wireless terminal is located without exchanging signals with the wireless terminal. It becomes possible. That is, the location registration update is completed when the wireless terminal transmits a location registration update signal to the macro cell base station, and the macro cell base station transmits the location registration update signal to the mobility management control device (MME).

  That is, as a result of the output adjustment on the macro cell side, the relationship between the macro cell and the small cell changes as the size of the macro cell changes. The left half of FIG. 3 shows a state before output adjustment, a plurality of cells are arranged in the macro cell, the small cells a1, a2, and a3 exist in the macro cell # 1, and the small cell a4 in the macro cell # 2. , A5, and a6 exist. Here, the output adjustment is performed, and the situation of the right half of FIG. 3 becomes such that the area of the macro cell # 1 becomes smaller and the area of the macro cell # 2 becomes larger. Then, the small cell a3 is managed on the macro cell # 2 side, the wireless terminal connected to the small cell a3 is managed on the macro cell # 2 side, and the wireless terminal transmits a location registration update signal to the macro cell # 2. To the base station.

  The C plane is a control signal process for mobile communication, and the U plane is a part where actual service data such as voice and text flows.

  The macro cell and the small cell are cells described below.

  In other words, wireless terminals such as mobile phones send radio waves to antennas installed in the city and use a telephone line network such as optical fiber from the antenna to the telephone station and from the telephone station to the antenna connected to the other party. An antenna has equipment for transmitting and receiving radio waves and data, and is called a base station. A range where radio waves reach from one base station is called a cell. A cell phone cell is usually a large cell with a radius of several hundred meters to several kilometers, which is called a macro cell. Macro means “huge”.

  On the other hand, a cell employing a small cell system with a radius of several tens of meters to several hundreds of meters is called a micro cell.

  The macro cell can cover a large area with one base station compared to the micro cell, but initially it was installed outdoors, so there is a problem that radio waves are difficult to reach in the shadows of large buildings, mountainous areas, or underground shopping streets. In order to improve such a situation, the introduction of small base stations called picocells or femtocells is also progressing in mobile phone services, which is referred to as small cells.

  Although there is no currently defined procedure for the mobile management control device (MME) to identify a small cell in which a wireless terminal is located, for example, the following two procedures are conceivable.

  First, a small cell base station that can be connected in the small cell frequency band is first searched for on the wireless terminal side. Next, a connectable small cell base station is specified. Finally, the location registration including the small cell ID is transmitted to the base station on the macro cell side.

  As a second method, first, the macro cell radio wave intensity is measured on the base station side of the small cell, and which macro cell is under control. Next, the ID of the wireless terminal is acquired by the small cell base station from the wireless terminal in the area. Finally, the small cell base station registers the base station ID of the macro cell in which the small cell base station is located and the wireless terminal ID located in the small cell with the mobility management control device (MME).

  Further, in the present embodiment, as shown in FIG. 4, in the case of a normal terminal such as a mobile phone and a wireless terminal with a small amount of movement such as an M2M (Machine-to-Machine) terminal provided in a vending machine or the like. Depending on the case, processing is different.

  That is, in the case of a wireless terminal with a small amount of movement such as an M2M terminal, the location management update interval of the mobility management parameter is extended, and when this location registration update interval exceeds a predetermined value, the mobility management control device (MME) At the same time, the mobile management is stopped and the data is also deleted from the mobile management parameter management server 22, and the location location is recorded in the subscriber database device (HSS). By doing so, it becomes possible to reduce mobility management resources in the mobility management control apparatus (MME), and thus it is possible to accommodate more radio terminals.

  That is, in the prior art, the mobility management control device (MME) manages the serving cell of the wireless terminal, and the subscriber database device (HSS) manages the mobility management control device (MME) in which the wireless terminal is accommodated. The terminal connection status is monitored and periodic location registration update processing is performed.

  In the present embodiment, as a result of extending the location registration update interval, if the location registration update interval becomes equal to or greater than a predetermined value and becomes an extremely large value, the location management processing of the wireless terminal becomes unnecessary and the mobility management control device (MME ) Determines that it is unnecessary to monitor the connection state of the wireless terminal.

  At this time, the mobility management control device (MME) transmits a location registration request including the serving cell information of the wireless terminal and the wireless terminal ID (IMSI, GUTI) to the subscriber database device (HSS) Register the location of the terminal in the subscriber database device (HSS). When the registration is completed, the subscriber database device (HSS) transmits a location management registration response to the mobility management control device (MME), and the mobility management control device (MME) stops the location management processing of the wireless terminal. When the mobility management control device (MME) receives a location registration request or a location resolution request from the wireless terminal, it transfers these to the subscriber database device (HSS) and resolves them.

  In addition, in the case where it is necessary to set the location registration update interval short, such as when a wireless terminal whose management has been transferred to a subscriber database device (HSS) sends a location registration request from a new cell, the location of the wireless terminal The management process is returned from the subscriber database device (HSS) to the mobility management control device (MME).

  Therefore, in the present embodiment, for wireless terminals with extremely low movement frequency, it is considered that movement management is unnecessary, movement management at the movement management control device (MME) is omitted, and the subscriber database device (HSS) side Thus, the cell where the wireless terminal is located can be managed, and the location management processing load of the mobility management control device (MME) can be reduced.

  The present invention relates to a mobile management network that accommodates mobile communication terminals in a mobile core network that manages a plurality of mobile communication terminals and radio base stations, manages connection positions of the mobile communication terminals, and enables terminal calls at all times. Even if it changes, it is possible to provide a mobile communication terminal location management system and method that can take over and use the same mobility management parameters.

  DESCRIPTION OF SYMBOLS 11 ... Wireless terminal (mobile communication terminal), 12 ... Wireless base station, 13 ... Wireless base station control device (eNodeB), 14 ... Mobility management control device (MME), 15 ... Subscriber database device (HSS), 16 ... Location Management function, 17 ... terminal call function, 21 ... location management optimization parameter storage unit, 22 ... movement management parameter management server.

Claims (6)

A plurality of mobile communication terminals are accommodated, the movement management parameters of the mobile communication terminals are held, and the position of the mobile communication terminal is managed based on the allocated paging area size and the position registration update interval included in the movement management parameters A mobile communication terminal location management system comprising a mobility management control device and a subscriber database device connected to the plurality of mobility management control devices, wherein the mobile communication terminal can be called at all times using the mobility management parameter In
It is connected to the plurality of mobility management control devices, holds the mobility management parameters optimized by the mobility management control device for each mobile communication terminal, and makes it possible to provide the mobility management parameters to the mobility management control device. Providing a mobility management parameter management server,
In accordance with the service type of the mobile communication terminal in the mobile management control device, the location management optimization parameter that defines the implementation range of the optimization process of the mobility management parameter of the mobile communication terminal is stored and the location management optimization parameter is A location management optimization parameter storage unit provided to the mobility management control device is provided in the subscriber database device,
In the mobility management control device,
When the mobility management parameter of the mobile communication terminal to be accommodated is registered in the mobility management parameter management server, the function of acquiring the registered mobility management parameter;
A function of acquiring the location management optimization parameter from the location management optimization parameter storage unit;
A function for optimizing the mobility management parameter of the mobile communication terminal to be accommodated based on the acquired location management optimization parameter;
A mobile communication terminal location management system comprising a function of registering the optimized mobility management parameter in the mobility management parameter management server. The location management optimization parameter is determined according to a service type of the mobile communication terminal, and adjusts an area size enlargement / reduction ratio for adjusting a paging area size in the mobility management parameter and a location registration update interval in the mobility management parameter. The mobile communication terminal location management system according to claim 1, further comprising: an update interval shortening / extension rate for performing The mobility management parameter includes information on the location registration update interval indicating a time interval at which the mobile communication terminal transmits a signal notifying its own location,
The mobility management control device includes:
When the location registration update interval in the mobility management parameter exceeds a predetermined value, information on the mobile communication terminal corresponding to the mobility management parameter is registered in the subscriber database device, and the location management processing for the mobile communication terminal is stopped. The mobile communication terminal location management system according to claim 1, wherein the mobile communication terminal location management system is provided. A plurality of mobile communication terminals are accommodated, the movement management parameters of the mobile communication terminals are held, and the position of the mobile communication terminal is managed based on the allocated paging area size and the position registration update interval included in the movement management parameters A mobile communication terminal location management method comprising: a mobility management control device; and a subscriber database device connected to the plurality of mobility management control devices, wherein the mobile communication terminal can be called at all times using the mobility management parameter In
It is connected to the plurality of mobility management control devices, holds the mobility management parameters optimized by the mobility management control device for each mobile communication terminal, and makes it possible to provide the mobility management parameters to the mobility management control device. Providing a mobility management parameter management server,
In accordance with the service type of the mobile communication terminal in the mobile management control device, the location management optimization parameter that defines the implementation range of the optimization process of the mobility management parameter of the mobile communication terminal is stored and the location management optimization parameter is A location management optimization parameter storage unit provided to the mobility management control device is provided in the subscriber database device,
The mobility management control device includes:
When the mobility management parameter of the mobile communication terminal to be accommodated is registered in the mobility management parameter management server, the registered mobility management parameter is acquired,
Obtaining the location management optimization parameter from the location management optimization parameter storage unit;
Based on the acquired location management optimization parameter, optimize the mobility management parameter of the mobile communication terminal to be accommodated,
The mobile communication terminal location management method, wherein the optimized mobility management parameter is registered in the mobility management parameter management server. The location management optimization parameter is determined according to a service type of the mobile communication terminal, and adjusts an area size enlargement / reduction ratio for adjusting a paging area size in the mobility management parameter and a location registration update interval in the mobility management parameter. The mobile communication terminal location management method according to claim 4, further comprising: an update interval shortening / extension rate for performing the operation. The mobility management parameter includes information on the location registration update interval indicating a time interval at which the mobile communication terminal transmits a signal notifying its own location,
The mobility management control device registers information related to the mobile communication terminal corresponding to the mobility management parameter in the subscriber database device when the location registration update interval in the mobility management parameter exceeds a predetermined value, and the mobile communication The location management process for a terminal is stopped. The mobile communication terminal location management method according to claim 4 or 5.

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