JP2018117272A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress a communication amount of a paging signal while reducing a processing load on a core network side. SOLUTION: A mobile communication system 100 has a territorial history database 70 for accumulating paging history information including time information at the time of successful paging processing for UE 10 and TA indicating a target area of the paging processing for each UE 10. An area where the UE 10 is likely to be in the area at that time based on the TA included in the aggregated paging history information, which aggregates the paging history information including the time zone corresponding to the time zone including the time when the paging process is executed. The area estimation unit 43 that estimates the TA including the above and the estimated TA are preferentially targeted, the paging process for the UE 10 is executed, and when the paging process is successful, the paging history information is registered in the territorial history database 70. The paging processing unit 44 is provided. [Selection diagram] Fig. 2

Description

  The present invention relates to a mobile communication system that performs paging processing.

  In a mobile communication system, a paging signal is transmitted from a node device to a mobile station in order to call a mobile station that has been in a non-communication state for a certain period of time (paging process). As a technique for reducing the communication amount of the paging signal, a method described in Patent Document 1 below is known. In this method, a list of base stations where the mobile station is likely to be present is created based on the estimated position of the mobile station at a predetermined time and the predicted position after movement of the mobile station. Request the base station to send a paging signal.

  Patent Document 2 below also describes a communication system that can suppress the amount of paging signal traffic. In this communication system, the mobile station estimates the cell in which the mobile station is currently located, first transmits a first paging signal in the estimated cell, and if the mobile station does not respond to the first paging signal, the cell The second paging signal is transmitted in a wider location registration area.

International Publication No. 2014/049911 JP 2010-246014 A

  However, in the conventional method described in Patent Document 1, it is necessary to perform a movement state prediction process for each mobile station at the time of transmission of a paging signal. Therefore, the processing load on the core network side including the node device is high. Tend to be. Further, in the conventional method described in Patent Document 2, the communication amount of the paging signal tends not to be sufficiently reduced depending on the estimation accuracy of the cell where the mobile station is currently located.

  Therefore, the present invention has been made in view of such problems, and provides a mobile communication system capable of effectively suppressing the communication amount of a paging signal while reducing the processing load on the core network side. For the purpose.

  In order to solve the above-described problem, a mobile communication system according to one aspect of the present invention provides time information when paging processing is successful for calling a mobile station for each mobile station and a position indicating a target area for the paging processing. The history information storage unit that accumulates paging history information including the registration area, and the paging history information that includes time information corresponding to the time zone that includes the time at which paging processing is executed are aggregated, and the positions included in the aggregated paging history information Based on the registration area, the area estimation unit that estimates the location registration area including the area where the mobile station is likely to be located at the time, and the location registration area estimated by the area estimation unit is preferentially moved If paging processing is executed for a station and the paging processing is successful, the paging history information related to the paging processing is recorded as a history. It includes a paging processor for registering the broadcast storing unit.

  According to the above aspect, the location registration areas where paging processing has been successful in the past are aggregated in the time zone for executing the paging processing, and the mobile station is highly likely to be located based on the aggregated location registration area A location registration area including the area is estimated. Then, the paging process is performed on the mobile station with the estimated location registration area as a target. As a result, the paging process can be efficiently executed using the history of the past paging process. As a result, it is possible to effectively reduce the communication amount of the paging signal without increasing the processing load on the core network of the mobile communication system.

  According to the present invention, it is possible to effectively suppress the communication amount of the paging signal while reducing the processing load on the core network side.

1 is a block diagram showing a configuration of a mobile communication system 100 according to a preferred embodiment of the present invention. It is a block diagram which shows the function structure of MME40 of FIG. It is a figure which shows the data structure of the paging history information of the aggregation object of the area estimation part 43 memorize | stored in the location history database 70 of FIG. It is a figure which shows the data structure of the estimated location TA for every time zone estimated by the area estimation part 43 of FIG. 3 is a flowchart showing a procedure of paging processing by the mobile communication system 100 of FIG. It is a block diagram which shows an example of the hardware constitutions of MME40 of FIG. 6 is a flowchart showing a modification of the procedure of paging processing by the mobile communication system 100 of FIG.

  Embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a block diagram showing a configuration of a mobile communication system 100 according to a preferred embodiment of the present invention. As shown in FIG. 1, this mobile communication system 100 includes a plurality of base station apparatuses 20, a location history database (history information storage unit) 70, an MME (Mobility Management Entity) 40, an S-GW (Serving). Gateway) 60 and a core network 90 including a P-GW (Packet data network Gate Way) 50. In FIG. 1, one in-zone history database 70, one MME 40, one S-GW 60, and one P-GW 50 are shown in the core network 90, but any or all of them are included in the actual mobile communication system 100. Are provided. A user equipment (UE) 10 (mobile station) including a smartphone and a tablet terminal can perform communication by connecting to the mobile communication system 100.

  The base station apparatus 20 is a radio base station connected to the MME 40 and an apparatus having a radio access control function. The base station apparatus 20 has, as basic functions, an admission control function when a call is made from the UE 10 and a paging process function that calls the UE 10 when another UE 10 or a server apparatus receives an incoming call to the UE 10. . The plurality of base station apparatuses 20 are accommodated in one TA (tracking area: location registration area) 30, and this location registration area TA 30 is a transmission target of an initial paging signal at the start of paging processing for the UE 10. The range of the area.

  The MME 40 is a node device connected to the UE 10 via the base station device 20 when a location registration request is received from the UE 10. Here, the MME 40 is a part that performs location management, authentication control of the UE 10 located in the network of the mobile communication system 100, and processing for setting a communication path (bearer) between the P-GW 50 and the UE 10. In addition, the MME 40 also has a function of controlling paging processing for the UE 10 when there is an incoming call to the UE 10. At this time, the MME 40 controls the paging process while accessing the located history database 70 in the core network 90. One MME 40 is configured to be connectable to the base station apparatus 20 in the pool area 80 including a plurality of TAs 30.

  The S-GW 60 is a packet switch, and transmits and receives data for providing communication services to the UE 10 with the P-GW 50. The P-GW is a gateway device connected to the external network NW, and transmits and receives data for providing communication services to the UE 10 with the external network NW.

  Next, the functional configuration of the MME 40 will be described with reference to FIG. FIG. 2 is a block diagram showing a functional configuration of the MME 40 in FIG. As shown in FIG. 2, the MME 40 is configured to include a location management unit 41, a paging request reception unit 42, an area estimation unit 43, a paging processing unit 44, and a location registration area storage unit 45 as functional components. ing. Hereinafter, each component will be described.

  The location management unit 41 has a function of managing the TA 30 in which UE 10 is most recently located for each UE 10 and a location registration request for transmitting a location registration signal for informing the core network 90 of the TA 30 in which the UE 10 exists. And a function of allocating a TA list for controlling each UE 10. That is, the location management unit 41 stores (registers) the information on the TA 30 in the area of the UE 10 acquired by the location registration request or the paging operation in the location registration area storage unit 45 for each UE 10. In addition, when the location management unit 41 receives a location registration signal from the UE 10, the location management unit 41 includes a TA list specified by information included in the location registration signal and includes a TA list including information on other TAs 30 in the pool area 80 for each UE 10. The TA list is set and stored (registered) in the location registration area storage unit 45 and notified to the UA 10. The UA 10 that has acquired the TA list operates to transmit a location registration request only when it moves out of the area of the plurality of TAs 30 specified by the TA list.

  The paging request reception unit 42 has a function of receiving a paging process start request from the external network NW or another UE 10 when there is an incoming call to the UE 10. The paging request reception unit 42 instructs the area estimation unit 43 and the paging processing unit 44 to start paging processing when there is a paging processing start request.

  When there is a request to start the paging process, the area estimation unit 43 is based on the TA total information about the TA 30 that is totaled from the paging history information stored in the in-zone history database 70, and at the time when the UE 10 performs paging. It has a function of estimating TA 30 including an area that is likely to be located at a certain paging execution time. FIG. 3 shows an example of the data configuration of the paging history information to be counted by the area estimation unit 43 stored in the located history database 70. As shown in FIG. 3, the paging history information is information indicating a history related to successful paging processing executed by the paging processing unit 44 in the past, and UE identification information “UE001” for identifying the UE 10 that is the target of the paging processing. And the time information “2016/12/1 08:00:00” indicating the time when the paging process is successful and the TA identification information “TA001” indicating the target TA of the paging process are associated with each other. This TA identification information indicates the TA in which the UE 10 was located when the paging process was successful, and indicates the target area for the paging process. The paging history information is accumulated for a predetermined period (for example, one month) for each UE 10 and stored in the in-zone history database 70.

  Specifically, the area estimation unit 43 aggregates the paging history information stored in the in-zone history database 70 at a predetermined timing, and performs TA identification for each UE identification information and for each time zone including the time indicated by the time information. Aggregate the number of information items. Then, the area estimation unit 43 determines the UE identification information having the largest number of cases for each UE identification information and for each time zone, and uses the UE identification information as a TA (estimated) that the UE 10 is likely to be in that zone. Estimated as TA). The timing for executing the counting process may be a timing of a predetermined time interval, a timing of a predetermined time, or a timing when a request to start paging processing for the corresponding UE 10 is made. . Here, the area estimation unit 43 determines that the UE 10 is present from the aggregated UE identification information only when the number of paging history information to be aggregated for each UE 10 exceeds a predetermined number (for example, 100 or more in the past month). Estimate TAs that are likely to be in a range. FIG. 4 shows an example of information on the estimated location TA for each time zone estimated by the area estimation unit 43. In the example illustrated in FIG. 4, the area estimation unit 43 aggregates the paging history information for each day of the week and time period, and as a result, the time period “Monday 0” indicated by the day information “Mon” and the time period information “0”. The TA indicated by the TA identification information “TA00X” is determined as the estimated location TA of the UE 10 indicated by the UE identification information “UE00X” in the time zone. Furthermore, the area estimation unit 43 stores information on the estimated location TA determined for each UE 10, for each day of the week, and for each time zone in the location registration area storage unit 45 each time.

  When receiving an instruction to start the paging process from the paging request receiving unit 42, the paging processing unit 44 executes the paging process for the UE 10. At this time, the paging processing unit 44 reads, from the location registration area storage unit 45, the estimated location TA corresponding to the time zone including the time to execute the paging process from the information of the estimated location TA corresponding to the UE 10. The paging process for the UE 10 is executed with the TA 30 indicated by the estimated in-service area TA as a target. For example, according to the example of the estimated location TA information shown in FIG. 4, when performing the paging process for the UE 10 identified by the UE identification information “UE001” at the time “Thursday 8 o'clock”, The TA 30 identified by the TA identification information “TA001” is set as an area to be preferentially subjected to paging processing. This paging process is started by requesting the base station apparatus 20 included in the targeted TA 30 from the paging processing unit 44 to transmit a paging signal to the corresponding UE 10. The UE 10 that has received the paging signal transmits a request for setting a bearer to the core network 90 via the base station device 20, and a bearer is set between the UE 10 and the core network 90 in response thereto. The paging processing unit 44 detects that the paging process is successful when the bearer setting is completed. Note that the paging processing unit 44 may detect the success of the paging process simply by the base station apparatus 20 receiving a reply to the paging signal from the UE 10. When the paging processing unit 44 detects the success of the paging process, the UE identification information for identifying the UE 10 that is the target of the paging process, the time information about the time when the paging process is performed, Paging history information including TA identification information for identifying the TA is stored (registered) in the location history database 70. This TA identification information is specified by reading the TA in which the UE 10 was located when the paging process was successful from the location registration area storage unit 45.

  On the other hand, when the paging processing for the UE 10 that preferentially targets the TA 30 indicated by the estimated location TA has failed, the paging processing unit 44 next stores the TA list stored in the location registration area storage unit 45. The paging process is executed again for all the TAs 30 included. In addition to the TA 30 in which the UE 10 was most recently located, the TA list includes other TAs 30 in the pool area 80. When the paging processing unit 44 detects the success of this paging process, it stores the paging history information related to the paging process in the location history database 70.

  Next, the paging process of the mobile communication system 100 configured as described above will be described. FIG. 5 is a flowchart showing an operation procedure of paging processing by the mobile communication system 100.

  As shown in FIG. 5, first, when an incoming call to a certain UE 10 is detected (step S01), the area estimation unit 43 of the MME 40 detects information about the TA 30 in which the UE 10 was most recently located and a paging history related to the corresponding UE 10. Information is read out (step S02). Thereafter, the area estimation unit 43 determines whether or not the paging history information related to the UE 10 exceeds a predetermined number (step S03). As a result of the determination, when it is determined that the paging history information exceeds the predetermined number (step S03; YES), the area estimation unit 43 adds the paging history information for each time zone, and the result of the calculation is displayed. Based on the estimated location TA, the paging processing unit 44 of the MME 40 performs the paging process for the estimated location TA (step S04). On the other hand, when it is determined that the paging history information does not exceed the predetermined number (step S03; NO), the paging processing unit 44 performs the paging process for the TA 30 in which the UE 10 was most recently located. (Step S05).

  Thereafter, the paging processing unit 44 detects whether or not the paging processing is successful (step S06). As a result, when the success of the paging process is detected (step S06; YES), the paging history information related to the successful paging process is stored in the located history database 70 by the paging processing unit 44 (step S08). If the success of the paging process is not detected (step S06; NO), the paging processing unit 44 reads the TA list from the location registration area storage unit 45, and targets a plurality of TAs 30 included in the TA list. The paging process is executed again (step S07). Finally, the paging history information related to the successful paging process is stored in the in-zone history database 70 by the paging processing unit 44 (step S08).

  Below, the effect of the mobile communication system 100 of this embodiment is demonstrated. In this mobile communication system 100, TAs for which paging processing has been successful in the past are aggregated in the time zone at which paging processing is performed, and include areas where the UE 10 is likely to be located based on the aggregated TA. TA is estimated. Then, the paging process is performed on the UE 10 with the estimated TA as a target. As a result, the paging process can be efficiently executed using the history of the past paging process. As a result, it is possible to effectively reduce the communication amount of the paging signal without increasing the processing load on the core network of the mobile communication system. In particular, in this embodiment, since the TA to be subjected to the paging process is determined based on the history of the successful paging process, the temporal network in addition to the temporal UE 10 user behavior pattern is determined. The paging process can be efficiently executed in consideration of the communication state including the congestion state.

  In the above embodiment, when the paging process for the estimated in-service area TA fails, the paging process is executed again for the TA for which the UE 10 has been registered in the immediate vicinity. Yes. Thereby, even when the estimation accuracy of the TA in which US10 is located is low, the paging process can be made more successful.

  Further, the estimated location TA is determined only when the number of pieces of paging history information to be counted exceeds a threshold value. By doing in this way, the estimation precision of TA which UE10 is located in improves, As a result, a paging process can be performed more efficiently.

  Further, the paging history information is totaled every day of the week and every time zone. In this case, it becomes easy to estimate the temporal tendency of the TA where the UE 10 is located by aggregation, and as a result, the paging process can be executed more efficiently.

  In addition, the block diagram used in the description of the above embodiment shows functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

  For example, each node constituting the mobile communication system 100 according to the embodiment of the present invention may function as a computer that performs processing of the mobile communication system 100 according to the present embodiment. FIG. 6 is a diagram illustrating an example of a hardware configuration of the MME 40 configuring the mobile communication system 100 according to the present embodiment. The MME 40 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

  Note that in the description in this specification, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the MME 40 may be configured to include one or a plurality of devices illustrated in the figure, or may be configured not to include some devices.

  Each function in the MME 40 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs an operation and performs communication by the communication device 1004 and data in the memory 1002 and the storage 1003. This is realized by controlling reading and / or writing.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the position management unit 41, the paging request reception unit 42, the area estimation unit 43, the paging processing unit 44, and the like may be realized by the processor 1001.

  Further, the processor 1001 reads a program (program code), software module, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the location management unit 41 of the MME 40 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the paging process according to the embodiment of the present invention.

  The storage 1003 is a computer-readable recording medium, such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003. For example, the location registration area storage unit 45 and the like may be realized by the storage 1003.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.

  The input device 1005 is an input device that accepts input from the outside, and the output device 1006 is an output device that performs output to the outside. The input device 1005 and the output device 1006 may be realized by a touch panel display in which both are integrated.

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

  The MME 40 includes hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). Alternatively, some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

  Although the present embodiment has been described in detail above, it will be apparent to those skilled in the art that the present embodiment is not limited to the embodiment described in this specification. The present embodiment can be implemented as a modification and change without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present embodiment.

  For example, the paging process by the mobile communication system 100 having the above-described configuration may be performed according to the procedure shown in FIG. FIG. 7 is a flowchart showing a modified example of the operation procedure of the paging process by the mobile communication system 100. This paging process is different from the procedure shown in FIG. 5 in that the area to be subjected to the paging process is changed in three stages.

  As shown in FIG. 7, first, when an incoming call to a certain UE 10 is detected (step S11), the area estimation unit 43 of the MME 40 detects information about the TA 30 in which the UE 10 was most recently located and a paging history related to the corresponding UE 10. Information is read (step S12). Thereafter, the area estimation unit 43 determines whether or not the paging history information related to the UE 10 exceeds a predetermined number (step S13). As a result of the determination, when it is determined that the paging history information exceeds a predetermined number (step S13; YES), the area estimation unit 43 adds the paging history information for each time zone, and the result of the calculation is displayed. Based on the estimated location TA, the paging processing unit 44 of the MME 40 executes the paging process for the estimated location TA (step S14). On the other hand, when it is determined that the paging history information does not exceed the predetermined number (step S13; NO), the paging process for the estimated in-service area TA is not executed and is skipped.

  Thereafter, the paging processing unit 44 detects whether or not the paging process is successful (step S15). As a result, when the success of the paging process is detected (step S15; YES), the paging history information related to the successful paging process is stored in the in-zone history database 70 by the paging processing unit 44 (step S19). On the other hand, when the success of the paging process is not detected (step S15; NO), or when the paging process for the estimated in-service area TA is not executed and skipped, the paging processing unit 44 causes the UE 10 to be closest. The paging process is executed for the TA 30 that has been in the area (step S16).

  Thereafter, the paging processor 44 detects whether or not the paging process is successful (step S17). As a result, when the success of the paging process is detected (step S17; YES), the paging history information related to the successful paging process is stored in the located history database 70 by the paging processing unit 44 (step S19). If the success of the paging process is not detected (step S17; NO), the paging processing unit 44 reads the TA list from the location registration area storage unit 45, and targets a plurality of TAs 30 included in the TA list. The paging process is executed again (step S18). Finally, the paging history information related to the successful paging process is stored in the in-zone history database 70 by the paging processing unit 44 (step S19).

  Even with the paging process procedure according to such a modification, the paging process can be more reliably succeeded when the estimation accuracy of the TA located in the US 10 is low.

  Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

  The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

  Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning.

  The names used for the parameters described above are not limiting in any way.

  As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  As long as “include”, “comprising”, and variations thereof, are used in the specification or claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  In this specification, a plurality of devices are also included unless there is only one device that is clearly present in context or technically.

  Throughout this disclosure, the plural is included unless the context clearly indicates one.

  DESCRIPTION OF SYMBOLS 10 ... UE (mobile station), 20 ... Base station apparatus, 30 ... TA (position registration area), 40 ... MME, 41 ... Location management part, 42 ... Paging request receiving part, 43 ... Area estimation part, 44 ... Paging process 45: Location registration area storage unit, 70: Location history database (history information storage unit), 90 ... Core network, 100 ... Mobile communication system.

Claims (4)

A history information storage unit that accumulates paging history information including time information at the time of success of paging processing for calling the mobile station for each mobile station and a location registration area indicating a target area of the paging processing;
The mobile station collects the paging history information including the time information corresponding to a time zone including the time for executing the paging process, and the mobile station sets the time at the time based on the location registration area included in the totaled paging history information. An area estimation unit that estimates a location registration area including an area that is likely to be located;
The paging process for the mobile station is executed with priority on the location registration area estimated by the area estimation unit, and the paging history information related to the paging process is stored in the history information when the paging process is successful. A paging processing unit to be registered in the copy,
A mobile communication system comprising: The paging processing unit performs paging processing on the location registration area estimated by the area estimation unit, and when the paging processing fails, the mobile station is in the immediate vicinity. The paging process is executed again for the area including the registered location registration area.
The mobile communication system according to claim 1. The area estimation unit estimates the location registration area based on the paging history information when the number of the paging history information to be counted exceeds a threshold.
The mobile communication system according to claim 1 or 2. The area estimation unit aggregates the paging history information for each day of the week and each time zone.
The mobile communication system according to any one of claims 1 to 3.

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