Method of registering position of mobile communication terminal, general calling method for mobile communication terminal and mobile communication system

• US 20030013445A1
• Filed: 07/30/2002
• Published: 01/16/2003
• Est. Priority Date: 11/16/2000
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Sasada, Koji, Yabusaki, Masami, Sawada, Masahiro, Fujiwara, Masumi, Watanabe, Yugo
• Granted Patent: US 7,113,784 B2
• Time in Patent Office: Days
• US Class Current: 455/435.1
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 68/04 multi-step notification using statistical or historical mobility data
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 84/005 Moving wireless networks

Abstract

A relay device installed in a moving unit can, by notifying an own identification number to a mobile communication network along with identification numbers of all mobile communication terminals subordinate to itself, perform en bloc updating of location registration area information of these mobile communication terminals. This relay device can receive an en bloc paging request wherein paging requests to plural subordinate mobile communication terminals are aggregated, reconstruct the received en bloc paging request, and transmit the paging requests to each of the mobile communication terminals subordinate to itself.

Claims

1. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area a mobile communication terminal belongs to;

wherein, in the event that said mobile communication terminal enters into a moving unit, said moving unit makes registration with said mobile communication network that said mobile communication terminal is subordinate to said moving unit;

and wherein in the event that there has been a change in the location registration area to which said moving unit belongs, said moving unit registers location registration area information indicating the location registration area to which said mobile communication terminal following the change belongs, in behalf of said mobile communication terminal contained therein.

2. A mobile communication terminal location registration method according to claim 1;

wherein said mobile communication terminal notifies said moving unit of a hierarchical registration request to the effect of registering a subordination relation as to said moving unit;

and wherein said moving unit stores the fact that said mobile communication terminal is subordinate to itself, while registering the subordination relation to said mobile communication network.

3. A mobile communication terminal location registration method according to claim 1, wherein the stage at which said moving unit registers subordination of mobile communication terminal to said moving unit with said mobile communication network is performed simultaneously with the stage for said moving unit to register said location registration area information with said mobile communication network.

4. A mobile communication terminal location registration method according to claim 1, wherein the stage at which said moving unit registers subordination of mobile communication terminal to said moving unit with said mobile communication network is performed by registering a terminal identification number for identifying said mobile communication terminal and a moving unit identification number for identifying said moving unit as a set with said mobile communication network.

6. A mobile communication terminal location registration method according to claim 1, wherein, in the event that said mobile communication terminal departs from said moving unit and the subordination relation is released, said mobile communication terminal notifies said mobile communication network of a release request for releasing the subordination relation.

7. A mobile communication terminal location registration method according to claim 6, wherein said mobile communication terminal notifies said mobile communication network of said release request via said moving unit.

8. A mobile communication terminal location registration method according to claim 2, wherein, in the event that said mobile communication terminal departs from said moving unit and the subordination relation is released, said mobile communication terminal notifies said moving unit of a release request for releasing the subordination relation.

9. A mobile communication terminal location registration method according to claim 8, wherein said mobile communication terminal notifies said moving unit of said release request via said mobile communication network.

5. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area a mobile communication terminal belongs to;

wherein, in the event that said mobile communication terminal enters into a moving unit, registration is made with said moving unit that said mobile communication terminal is subordinate to said moving unit;

and wherein in the event that there has been a change in the location registration area to which said moving unit belongs, said moving unit registers location registration area information indicating the location registration area to which said mobile communication terminal following the change belongs, in behalf of said mobile communication terminal contained therein.

10. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area mobile communication terminals belong to;

wherein plural mobile communication terminals are placed in a hierarchical subordination relation;

wherein a mobile communication terminal serving as a child notifies terminal identification numbers of mobile communication terminals at lower hierarchical levels than itself to a mobile communication terminal serving as a parent, along with own terminal identification number;

and wherein a mobile communication terminal at the highest order registers, with said mobile communication network, terminal identification numbers of mobile communication terminals at lower hierarchical levels than itself to said mobile communication network, along with own terminal identification number;

and wherein, in the event that there is a change in the location registration area, only the highest order mobile communication terminal registers the location registration area information with said mobile communication network.

12. A mobile communication terminal location registration method according to claim 10, wherein said mobile communication terminal serving as a parent stores the terminal identification number of a mobile communication terminal serving as a child.

15. A mobile communication terminal location registration method according to claim 10, wherein, in the event of releasing a parent-child subordination relation, the child mobile communication terminal notifies said mobile communication network of the terminal identification number of the parent mobile communication terminal and own terminal identification number;

and wherein said mobile communication network releases the parent-child subordination relation based on the terminal identification number of the child and the terminal identification number of the parent.

11. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area mobile communication terminals belong to;

wherein plural mobile communication terminals are placed in a hierarchical subordination relation;

wherein a mobile communication terminal serving as a child notifies a mobile communication terminal, serving as a parent, of a terminal identification number;

and wherein a mobile communication terminal serving as a parent registers, with said mobile communication network, the terminal identification number of a mobile communication terminal serving as a child, along with own terminal identification number;

and wherein, in the event that there is a change in the location registration area, said mobile communication network updates the location registration area information for only the highest order mobile communication terminal.

16. A mobile communication terminal location registration method according to claim 15, wherein the child mobile communication terminal notifies said mobile communication network of the terminal identification number of the parent and own terminal identification number via said parent mobile communication terminal.

17. A mobile communication terminal location registration method according to claim 12, wherein, in the event of releasing a parent-child subordination relation, the child mobile communication terminal notifies said parent mobile communication terminal of the terminal identification number of the parent mobile communication terminal and own terminal identification number;

and wherein said parent mobile communication terminal deletes the terminal identification number of the child mobile communication terminal.

18. A mobile communication terminal location registration method according to claim 12, wherein, in the event of releasing a parent-child subordination relation, the child mobile communication terminal notifies said mobile communication network of a release request containing the terminal identification number of the parent mobile communication terminal and own terminal identification number;

and wherein said mobile communication network notifies said release request to said parent mobile communication terminal;

and wherein said parent mobile communication terminal deletes the terminal identification number of the child mobile communication terminal.

20. An en bloc paging method for mobile communication terminals according to claim 19, wherein, upon said representative mobile communication terminal receiving an en bloc paging request, said representative mobile communication terminal transmits an paging request to said mobile communication terminals specified by said en bloc paging request.

21. An en bloc paging method for mobile communication terminals according to claim 20, wherein, upon said mobile communication terminals receiving said paging request from said representative mobile communication terminal, said mobile communication terminals each transmit paging responses to said mobile communication network.

22. An en bloc paging method for mobile communication terminals according to claim 20;

wherein, upon said mobile communication terminals each receiving said paging request from said representative mobile communication terminal, said mobile communication terminals each transmit said paging responses to said representative mobile communication terminal;

and wherein said representative mobile communication terminal transmits said paging responses that have been received, to said mobile communication network.

23. An en bloc paging method for mobile communication terminals according to claim 20;

wherein, upon said mobile communication terminals each receiving said paging request from said representative mobile communication terminal, said mobile communication terminals each transmit paging responses to said representative mobile communication terminal;

and wherein said representative mobile communication terminal generates an en bloc paging response obtained by aggregation of said paging responses that have been received, and transmits to said mobile communication network.

24. An en bloc paging method for mobile communication terminals according to claim 22;

wherein said mobile communication network comprises a plurality of base stations and a plurality of switches;

and wherein said mobile communication terminals transmit said paging responses to said representative mobile communication terminal with a smaller transmitting power as compared to the transmitting power for communicating with said base stations.

25. An en bloc paging method for mobile communication terminals according to claim 23;

wherein said mobile communication network comprises a plurality of switches and a plurality of base stations;

and wherein said representative mobile communication terminal transmits said en bloc paging responses to said switches via said base stations;

and wherein said switches divide said en bloc paging response that has been received and generate said paging responses.

26. An en bloc paging method for mobile communication terminals according to claim 19, wherein said representative mobile communication terminal is a predetermined mobile communication terminal.

29. A relay device according to claim 28, wherein said en bloc paging request contains each set of terminal identification information for identifying said mobile communication terminals corresponding to each said termination request;

and wherein said processing unit combines each set of terminal identification information contained in said en bloc paging request that has been received, and identification information for identifying said relay device, and generates said paging requests.

30. A relay device according to claim 29, wherein said reception unit receives the paging responses transmitted from said mobile communication terminals;

and wherein said processing unit aggregates said paging responses received in each predetermined time and generates an en bloc paging response;

and wherein said transmission unit transmits said generated en bloc paging response to said base station.

31. A relay device according to claim 28, wherein said mobile communication network comprises a plurality of switches and a plurality of base stations;

and wherein said en bloc paging request is transmitted via said base stations, and contains each set of terminal identification information for identifying said mobile communication terminals corresponding to said termination requests;

and wherein said processing unit generates said termination requests for each set of said terminal identification information contained in said en bloc paging requests received.

32. A relay device according to claim 28, which is configured of a mobile communication terminal.

13. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area mobile communication terminals belong to;

wherein plural mobile communication terminals are placed in a hierarchical subordination relation;

wherein a mobile communication terminal serving as a child registers, with said mobile communication network, the terminal identification number of a parent and own terminal identification number, upon receiving a terminal identification number from a mobile communication terminal serving as a parent;

and wherein, in the event that there is a change in the location registration area, said mobile communication network updates the location registration area information for only the highest order mobile communication terminal.

14. A mobile communication terminal location registration method for registering, with a mobile communication network, location registration area information indicating which location registration area mobile communication terminals belong to;

wherein plural mobile communication terminals are placed in a hierarchical subordination relation;

wherein a mobile communication terminal serving as a child notifies a mobile communication terminal, serving as a parent, of a terminal identification number;

and wherein a mobile communication terminal serving as a parent stores the terminal identification number of a mobile communication terminal serving as a child;

and wherein, in the event that there is a change in the location registration area, said mobile communication terminal serving as a parent registers the location registration area information with the mobile communication network.

19. An en bloc paging method for mobile communication terminals, wherein a plurality of mobile communication terminals are aggregated to form a group, and one of the mobile communication terminals belonging to said group is set as a representative mobile communication terminal, said mobile communication terminals performing communication with a mobile communication network which stores which location registration area said representative mobile communication terminal belongs to as well as the correlation between other mobile communication terminals belonging to said group and said representative mobile communication terminal;

wherein termination requests occurring within a predetermined time are stored;

and wherein, of said termination requests, those with said mobile communication terminals correlated to the same said representative mobile communication terminal as the termination destinations thereof are specified;

and wherein an en bloc paging request for specifying all of said mobile communication terminals correlating to the specified plurality of termination requests is generated;

and wherein said en bloc paging request is transmitted to the location registration area where said representative mobile communication terminal exists.

27. A relay device which is installed in a moving unit and which registers location registration area information indicating which location registration area that mobile communication terminals contained within said moving unit belong to, with a mobile communication network;

said relay device comprising;

a transmission/reception unit for performing transmission/reception of signals with an external device;

a first storing unit which, upon said transmission/reception unit receiving, from said mobile communication terminal, a hierarchy request containing a terminal identification number for identifying said mobile communication terminal, stores said terminal identification number that has been received;

a second storing unit for storing, beforehand, a moving unit identification number for identifying said moving unit;

a third storing unit for storing location registration area information indicating a location registration area; and

a control unit which, in the event of detecting a change in said location registration area upon comparing location registration area information received from said mobile communication network via said transmission/reception unit with location registration area information stored in said third storing unit, stores the received location registration area information in said third storing unit, but which, on the other hand, in the event of detecting change in first location registration area following reception of said hierarchy request, transmits a hierarchy location registration request containing said moving unit identification number, said terminal identification numbers, and said new location registration area information, to said mobile communication network, using said transmission/reception unit.

28. A relay device for performing communication with a mobile communication network wherein a plurality of mobile communication terminals are aggregated and registered as a group, and wherein in the event that there are termination requests within a predetermined time to a plurality of mobile communication terminals belonging to said group, an en bloc paging request which is a compilation of the paging requests corresponding to the termination requests is transmitted, said relay device comprising:

a reception unit for receiving said en bloc paging request;

a processing unit for dividing said en bloc paging request that has been received and generating said paging requests; and

a transmitting unit for transmitting said generated paging requests to the mobile communication terminals belonging to said group.

33. A mobile communication terminal which, upon being contained in a moving unit to which a relay device is disposed, registers location registration area information indicating which location registration area it belongs to, with a mobile communication network, using said relay device, said mobile communication terminal comprising:

a transmission/reception unit for performing transmission/reception of signals with an external device;

an advertisement information monitoring unit for detecting whether or not said mobile communication terminal is subordinate to said relay device, based on advertisement information transmitted from said relay device using said transmission/reception unit; and

a control unit for, in the event that the state of said mobile communication terminal changes from a state of non-subordination to said relay device to a state of subordination, transmitting a hierarchical registration request for registering the subordination relation to said relay device or said mobile communication network, using said transmission/reception unit.

34. A mobile communication terminal according to claim 33, wherein in the event that the state of said mobile communication terminal changes from a state of subordination to said relay device to a state of non-subordination, said control unit transmits a release request for releasing the subordination relation to said relay device or said mobile communication network, using said transmission/reception unit.

35. A mobile communication terminal according to claim 33, wherein said advertisement information contains a moving unit identification number for identifying said moving unit, said mobile communication terminal comprising:

a moving unit identification number storing unit for storing said moving unit identification number; and

a terminal identification number storing unit for storing a terminal identification number for identifying said mobile communication terminal;

wherein said control unit transmits said release request containing said moving unit identification number read out from said moving unit identification number storing unit and said terminal identification number read out from said terminal identification number storing unit, using said transmission/reception unit.

37. A mobile communication terminal according to claim 36, wherein, in the event that said mobile communication terminal becomes a parent, a hierarchy registration request containing said own terminal identification number and said child terminal identification number is transmitted to said mobile communication network.

38. A mobile communication terminal according to claim 36, wherein, in the event that said mobile communication terminal becomes a child, a hierarchy registration request containing said own terminal identification number and said parent terminal identification number is transmitted to said mobile communication network.

39. A mobile communication terminal according to claim 36, wherein, in the event of releasing the hierarchical relation after said mobile communication terminal has become a child, a release request containing said own terminal identification number and said parent terminal identification number is transmitted to said mobile communication network.

36. A mobile communication terminal which performs communication with a mobile communication network, and autonomously constructs hierarchical relations with other mobile communication terminals, said mobile communication terminal comprising:

a first storing unit for storing own terminal identification number for identifying said mobile communication terminal;

an advertisement unit for performing advertisement of terminal advertisement information containing said own terminal identification number;

a hierarchy unit wherein, in the event of receiving said terminal advertisement information advertised from another mobile communication terminal, one of said mobile communication terminal and the other mobile communication terminal becomes a parent and the other becomes a child, following predetermined rules;

a second storing unit for storing a child terminal identification number for identifying the mobile communication terminal to be a child, in the event that said mobile communication terminal becomes a parent; and

a third storing unit for storing a parent terminal identification number for identifying the mobile communication terminal to be a parent, in the event that said mobile communication terminal becomes a child.

40. A location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches and managing location registration area information indicating which location registration area said mobile communication terminals belong to, said location information managing device comprising:

a moving unit table for storing, in a correlated manner, a terminal identification number for identifying a mobile communication terminal, and a moving unit identification number corresponding to a moving unit to which mobile communication terminal having said terminal identification number belongs; and

a location table for storing, in a correlated manner, said terminal identification number and said moving unit identification number, and said location registration area information.

41. A location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches and managing location registration area information indicating which location registration area said mobile communication terminals belong to, said location information managing device comprising:

a hierarchical table for storing, in a correlated manner, a terminal identification number for identifying a mobile communication terminal to be a parent, and a terminal identification number of a mobile communication terminal to be a child; and

a location table for storing, in a correlated manner, said terminal identification number and said location registration area information.

42. A location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches and managing location registration area information indicating which location registration area said mobile communication terminals belong to, said location information managing device comprising:

an extended location table for storing, in a correlated manner, a terminal identification number for identifying said mobile communication terminal and a moving unit identification number for identifying a moving unit, location registration area information of said mobile communication terminal, and a moving unit identification number of a moving unit to which said mobile communication terminal is subordinate.

43. A location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches, said location information managing device comprising:

an extended location table for storing, in a correlated manner, a terminal identification number for identifying said mobile communication terminal, location registration area information of said mobile communication terminal, and a terminal identification number of a mobile communication terminal to which said mobile communication terminal is subordinate.

44. An en bloc paging request generating device, used with a mobile communication system comprising a plurality of switches and a plurality of base stations, wherein a plurality of mobile communication terminals are aggregated to form a group, and wherein one mobile communication terminal belonging to said group is handled as a representative mobile communication terminal, said en bloc paging request generating device comprising:

a table for storing which location registration area said representative mobile communication terminal belongs to, along with storing the correlation between other mobile communication terminals belonging to said group and said representative mobile communication terminal;

a storing unit for storing termination requests; and

a control unit for reading out said termination requests from said storing unit once every predetermined time, determining, of the termination requests read out, those having said mobile communication terminals correlated with same said representative mobile communication terminal as the termination destinations thereof, by making reference to said table, and generating an en bloc paging request for specifying all of said mobile communication terminals corresponding to the determined plurality of termination requests.

45. An en bloc paging request generating device according to claim 44, wherein said table contains a first table and a second table;

wherein said first table stores, in a correlated manner, representative terminal identification information for identifying said representative mobile communication terminal and location registration area information indicating the location registration area where said representative mobile communication terminal belongs;

and wherein said second table stores, in a correlated manner, each of terminal identification information for identifying the other mobile communication terminals belonging to said group and said representative terminal identification information;

and wherein said control unit reads out termination requests from said storing unit once every predetermined time, extracts each of said terminal identification information contained in said termination requests that have been read out, determines each of said representative terminal identification information by searching said second table based on each of the extracted terminal identification information, groups said terminal identification information which matches said determined representative terminal identification information, determines said location registration area information by searching said first table based on said representative terminal identification information of each group, and generates an en bloc paging request containing each of said terminal identification information grouped with regard to the location registration area indicated by said location registration area information that has been determined.

46. A switch, used with a mobile communication system wherein a plurality of mobile communication terminals are aggregated to form a group, and one of the mobile communication terminals belonging to said group receives the paging responses from other mobile communication terminals belonging to said group and generates an en bloc paging response wherein said paging responses are aggregated, and transmits said en bloc paging response to a base station;

wherein, upon receiving said en bloc paging response from said base station, said switch reconfigures said en bloc paging response into individual said paging responses, which said switch outputs.

47. A mobile communication network, comprising:

a plurality of switches;

a plurality of base stations; and

an en bloc paging request generating device, used with a mobile communication system comprising a plurality of switches and a plurality of base stations, wherein a plurality of mobile communication terminals are aggregated to form a group, and wherein one of the mobile communication terminals belonging to said group is handled as a representative mobile communication terminal, said en bloc paging request generating device comprising

a table for storing which location registration area said representative mobile communication terminal belongs to, along with storing the correlation between other mobile communication terminals belonging to said group and said representative mobile communication terminal,

a storing unit for storing termination requests, and

a control unit for reading out said termination requests from said storing unit once every predetermined time, determining, of the termination requests read out, those having said mobile communication terminals correlated with the same representative mobile communication terminal as the termination destinations thereof, by making reference to said table, and generating an en bloc paging request for specifying all of said mobile communication terminals corresponding to the determined plurality of termination requests.

48. A mobile communication system, comprising:

a plurality of base stations, and one or a plurality of switches;

a location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches and managing location registration area information indicating which location registration area said mobile communication terminals belong to, said location information managing device comprising

a moving unit table for storing, in a correlated manner, a terminal identification number for identifying a mobile communication terminal, and a moving unit identification number corresponding to a moving unit to which mobile communication terminal having said terminal identification number belongs, and

a location table for storing, in a correlated manner, said terminal identification number and said moving unit identification number, and said location registration area information;

a relay device which is installed in a moving unit and which registers location registration area information indicating which location registration area that mobile communication terminals contained within said moving unit belong to, with a mobile communication network, said relay device comprising

a transmission/reception unit for performing transmission/reception of signals with an external device,

a first storing unit which, upon said transmission/reception unit receiving, from said mobile communication terminals, a hierarchy request containing a terminal identification number for identifying said mobile communication terminal, stores said terminal identification number that has been received,

a second storing unit for storing, beforehand, a moving unit identification number for identifying said moving unit,

a third storing unit for storing location registration area information indicating a location registration area, and

a control unit which, in the event of detecting a change in said location registration area upon comparing location registration area information received from said mobile communication network via said transmission/reception unit with location registration area information stored in said third storing unit, stores the received location registration area information in said third storing unit, but which, on the other hand, in the event of detecting change in said first location registration area following reception of said hierarchy request, transmits a hierarchy location registration request containing said moving unit identification number, said terminal identification numbers, and said new location registration area information, to said mobile communication network, using said transmission/reception unit; and

a mobile communication terminal which, upon being contained in a moving unit to which a relay device is disposed, registers location registration area information indicating which location registration area it belongs to, with a mobile communication network, using said relay device, said mobile communication terminal comprising

a transmission/reception unit for performing transmission/reception of signals with an external device,

an advertisement information monitoring unit for detecting whether or not said mobile communication terminal is subordinate to said relay device, based on advertisement information transmitted from said relay device using said transmission/reception unit, and

a control unit for, in the event that the state of said mobile communication terminal changes from a state non-subordination to said relay device to a state of subordination, transmitting a hierarchical registration request for registering the subordination relation to said relay device or said mobile communication network, using said transmission/reception unit.

49. A mobile communication system, comprising:

a plurality of base stations, and one or a plurality of switches;

a location information managing device which is used with a mobile communication network comprising a plurality of base stations which perform communication with mobile communication terminals and a plurality of switches which perform communication with the base stations, for performing communication with said plurality of switches and managing location registration area information indicating which location registration area said mobile communication terminals belong to, said location information managing device comprising

a hierarchical table for storing, in a correlated manner, an terminal identification number for identifying a mobile communication terminal to be a parent, and a terminal identification number of a mobile communication terminal to be a child, and

a location table for storing, in a correlated manner, said terminal identification number and said location registration area information; and

a mobile communication terminal which performs communication with a mobile communication network, and autonomously constructs hierarchical relations with other mobile communication terminals, said mobile communication terminal comprising

a first storing unit for storing own terminal identification number for identifying said mobile communication terminal,

an advertisement unit for performing advertisement of terminal advertisement information containing said own terminal identification number,

a hierarchy unit wherein, in the event of receiving said terminal advertisement information advertised from another mobile communication terminal, one of said mobile communication terminal and the other mobile communication terminal becomes a parent and the other becomes a child, following predetermined rules,

a second storing unit for storing a child terminal identification number for identifying the mobile communication terminal to be a child, in the event that said mobile communication terminal becomes a parent, and

a third storing unit for storing a parent terminal identification number for identifying the mobile communication terminal to be a parent, in the event that said mobile communication terminal becomes a child.