MOBILE COMMUNICATION SYSTEM AND MOBILE COMMUNICATION METHOD

• US 20150195828A1
• Filed: 07/23/2013
• Published: 07/09/2015
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Fujishiro, Masato, Morita, Kugo
• Granted Patent: US 9,918,318 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

In a mobile communication system, user data is communicated directly among a plurality of radio terminals without passing through a radio base station. The communication of user data directly performed among the plurality of radio terminals is performed by using a part of radio resources assigned to the mobile communication system. A D2D terminal included in the plurality of radio terminals notifies the radio base station of an identifier of a neighboring terminal located in the neighborhood of the D2D terminal, or the neighboring terminal notifies the radio base station of the identifier of the D2D terminal.

Claims

1. A mobile communication system in which user data is communicated directly among a plurality of radio terminals without passing through a radio base station, wherein

the communication of user data directly performed among the plurality of radio terminals is performed by using a part of radio resources assigned to the mobile communication system,

a D2D terminal included in the plurality of radio terminals notifies the radio base station of an identifier of a neighboring terminal located in the neighborhood of the D2D terminal, or

the neighboring terminal notifies the radio base station of the identifier of the D2D terminal.

2. The mobile communication system according to claim 1, wherein

the D2D terminal notifies the radio base station of a received power of a signal transmitted from the neighboring terminal, together with the identifier of the neighboring terminal, or

the neighboring terminal notifies the radio base station of the received power of the signal transmitted from the D2D terminal, together with the identifier of the D2D terminal.

3. The mobile communication system according to claim 1, wherein

the D2D terminal notifies the radio base station of the identifier of the neighboring terminal in response to an instruction received from the radio base station, or

the neighboring terminal notifies the radio base station of an identifier of the D2D terminal in response to an instruction received from the radio base station.

4. The mobile communication system according to claim 2, wherein

the D2D terminal notifies the radio base station of the received power of the signal transmitted from the neighboring terminal in response to a result of comparison between the received power of the signal transmitted from the neighboring terminal and a threshold value, or

the neighboring terminal notifies the radio base station of the received power of the signal transmitted from the D2D terminal in response to a result of comparison between the received power of the signal transmitted from the D2D terminal and a threshold value.

5. The mobile communication system according to claim 4, wherein

the D2D terminal is notified, from the radio base station, of the threshold value compared with the received power of the signal transmitted from the neighboring terminal, or

the neighboring terminal is notified, from the radio base station, of the threshold value compared with the received power of the signal transmitted from the D2D terminal.

6. The mobile communication system according to claim 1, wherein

the D2D terminal is notified, from the radio base station, of a cycle in which the identifier of the neighboring terminal is notified to the radio base station, or

the neighboring terminal is notified, from the radio base station, of a cycle in which the identifier of the D2D terminal is notified to the radio base station.

7. The mobile communication system according to claim 1, wherein the radio base station or a node higher than the radio base station specifies a distribution of radio terminals present in a cell managed by the radio base station on the basis of the identifier of the neighboring terminal notified from the D2D terminal or the identifier of the D2D terminal notified from the neighboring terminal.

8. The mobile communication system according to claim 7, wherein the radio base station or a node higher than the radio base station specifies the distribution of radio terminals present in the cell managed by the radio base station on the basis of the identifier of the neighboring terminal notified from the D2D terminal and a received power of a signal transmitted from the neighboring terminal or the identifier of the D2D terminal notified from the neighboring terminal and a received power of a signal transmitted from the D2D terminal.

9. The mobile communication system according to claim 7, wherein the radio base station or a node higher than the radio base station specifies the distribution of radio terminals present in the cell managed by the radio base station on the basis of the identifier of the neighboring terminal notified from the D2D terminal and Timing Advance of the D2D terminal or the identifier of the D2D terminal notified from the neighboring terminal and Timing Advance of the neighboring terminal.

10. The mobile communication system according to claim 1, wherein

the radio base station controls a D2D terminal radio resource to be assigned to the D2D terminal or a neighboring terminal radio resource to be assigned to the neighboring terminal on the basis of the identifier of the neighboring terminal or the identifier of the D2D terminal.

11. The mobile communication system according to claim 10, wherein

the radio base station is notified of a D2D terminal received power of a signal transmitted from the neighboring terminal, together with the identifier of the neighboring terminal from the D2D terminal, or a neighboring terminal received power of a signal transmitted from the D2D terminal, together with the identifier of the D2D terminal from the neighboring terminal, and

the radio base station controls the D2D terminal radio resource or the neighboring terminal radio resource on the basis of the identifier of the neighboring terminal and the D2D terminal received power or the identifier of the D2D terminal and the neighboring terminal received power.

12. The mobile communication system according to claim 10, wherein the radio base station controls the D2D terminal radio resource or the neighboring terminal radio resource so that the D2D terminal radio resource and the neighboring terminal radio resource do not overlap when it is determined that a distance between the D2D terminal and the neighboring terminal is smaller than a threshold value.

13. The mobile communication system according to claim 10, wherein the radio base station controls the D2D terminal radio resource or the neighboring terminal radio resource so that the D2D terminal radio resource and the neighboring terminal radio resource overlap when it is determined that a distance between the D2D terminal and the neighboring terminal is larger than a threshold value.

14. The mobile communication system according to claim 10, wherein

the neighboring terminal communicates the user data via the radio base station, and

the radio base station controls the D2D terminal radio resource or the neighboring terminal radio resource so that the D2D terminal radio resource and the neighboring terminal radio resource do not overlap when it is determined that a distance between the radio base station and the neighboring terminal is larger than a distance between the radio base station and the D2D terminal.

15. The mobile communication system according to claim 10, wherein

the neighboring terminal communicates the user data via the radio base station, and

the radio base station controls the D2D terminal radio resource or the neighboring terminal radio resource so that the D2D terminal radio resource and the neighboring terminal radio resource overlap when it is determined that a distance between the radio base station and the neighboring terminal is smaller than a distance between the radio base station and the D2D terminal.

16. The mobile communication system according to claim 10, wherein the radio base station notifies another radio base station different from the radio base station of the identifier of the neighboring terminal or the identifier of the D2D terminal.

17. The mobile communication system according to claim 11, wherein the radio base station notifies the other radio base station of the D2D terminal received power, together with the identifier of the neighboring terminal, or the neighboring terminal received power, together with the identifier of the D2D terminal.

18. A mobile communication method used in a mobile communication system, in which communication of user data is directly performed among a plurality of radio terminals without passing through a radio base station, wherein

the communication of user data directly performed among the plurality of radio terminals is performed by using a part of radio resources assigned to the mobile communication system,

the mobile communication method comprises:

a step of notifying the radio base station, of an identifier of a neighboring terminal located in the neighborhood of the D2D terminal, from a D2D terminal included in the plurality of radio terminals, or

a step of notifying the radio base station of an identifier of the D2D terminal, from the neighboring terminal.

19. The mobile communication system according to claim 18, further comprises:

a step of controlling, at the radio base station, a D2D terminal radio resource to be assigned to the D2D terminal or a neighboring terminal radio resource to be assigned to the neighboring terminal on the basis of the identifier of the neighboring terminal or the identifier of the D2D terminal.