MOBILE COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND D2D TERMINAL

• US 20150373730A1
• Filed: 02/07/2014
• Published: 12/24/2015
• Est. Priority Date: 02/12/2013
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: FUJISHIRO, Masato, ADACHI, Hiroyuki, TONG, Fangwei, MORITA, Kugo
• Granted Patent: US 9,820,287 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A mobile communication system supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network. The system comprises a communication apparatus that assigns a radio resource to a D2D terminal that performs the D2D communication, wherein the communication apparatus performs assignment determination as to whether a dedicated radio resource not shared with the cellular communication is assigned to the D2D terminal or a shared radio resource shared with the cellular communication is assigned to the D2D terminal.

Claims

1. A mobile communication system that supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the system comprising

a communication apparatus configured to assign a radio resource to a D2D terminal that performs the D2D communication, wherein

the communication apparatus performs assignment determination as to whether a dedicated radio resource not shared with the cellular communication is assigned to the D2D terminal or a shared radio resource shared with the cellular communication is assigned to the D2D terminal.

2. The mobile communication system according to claim 1, wherein the communication apparatus performs the assignment determination on the basis of an amount of radio resource to be used in a cell in which the D2D terminal exists.

3. The mobile communication system according to claim 1, wherein the communication apparatus performs the assignment determination on the basis of a communication quality of the D2D communication.

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

the communication quality includes a status of an interference suffered by the D2D terminal,

the communication apparatus instructs the D2D terminal to perform an interference detection, and

the D2D terminal reports an interference detection result to the communication apparatus on the basis of an instruction of the interference detection.

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

the communication apparatus performs the assignment determination on the basis of information on a pathloss between the D2D terminal and other device, and

the other device is any of:

a cellular terminal that performs the cellular communication, a base station that assigns the radio resource to the D2D terminal, another D2D terminal that is not a communication partner of the D2D terminal, and other D2D terminal that is a communication partner of the D2D terminal.

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

one of the D2D terminal, the cellular terminal, and the other D2D terminal reports the information on the pathloss to the communication apparatus, and

the communication apparatus receives the information on the pathloss, and performs the assignment determination on the basis of the received information.

7. A communication apparatus that assigns a radio resource to a D2D terminal that performs D2D communication in a mobile communication system that supports cellular communication in which a data path passes through a core network and the D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, comprising

a controller configured to perform assignment determination as to whether a dedicated radio resource not shared with the cellular communication is assigned to the D2D terminal or a shared radio resource shared with the cellular communication is assigned to the D2D terminal.

8. A mobile communication system that supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the system comprising:

a base station;

a cellular terminal configured to perform the cellular communication in a cell of the base station; and

a D2D terminal configured to perform the D2D communication in the cell by using a shared radio resource shared with the cellular communication, wherein

at least one communication apparatus among the base station, the cellular terminal, and the D2D terminal performs null steering so as to suppress an influence of interference between the cellular communication and the D2D communication.

9. The mobile communication system according to claim 8, wherein the base station performs the null steering of directing a null to the D2D terminal, on the basis of a reference signal received by the base station from the D2D terminal.

10. The mobile communication system according to claim 8, wherein

the D2D terminal transmits, to the base station, precoder matrix information for directing null to the D2D terminal by the base station, and

the base station performs the null steering of directing the null to the D2D terminal, on the basis of the precoder matrix information.

11. The mobile communication system according to claim 8, wherein

the D2D terminal generates precoder matrix information for directing null to the D2D terminal by the cellular terminal, and

the cellular terminal performs the null steering of directing the null to the D2D terminal, on the basis of the precoder matrix information.

12. A communication apparatus used in a mobile communication system that supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the apparatus comprising

a controller configured to perform null steering so as to suppress an influence of interference between the cellular communication and the D2D communication, wherein

the communication apparatus is one of a base station, a cellular terminal that performs the cellular communication, and a D2D terminal that performs the D2D communication, and

the D2D communication is performed by using a shared radio resource shared with the cellular communication.

13. A mobile communication system that supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the system comprising:

a communication apparatus;

a cellular terminal that performs the cellular communication; and

a D2D terminal that performs the D2D communication by using a shared radio resource shared with the cellular communication, wherein

the D2D terminal notifies the communication apparatus of information on a D2D communication pathloss that is a pathloss between the D2D terminal and another D2D terminal that is a communication partner of the D2D terminal, and

the communication apparatus controls transmission power of at least one of the cellular terminal, the communication apparatus, and the D2D terminal, on the basis of the information on the D2D communication pathloss.

14. The mobile communication system according to claim 13, wherein

the shared radio resource is provided in an uplink radio resource of the cellular communication, and

the communication apparatus performs a transmission power control so as to increase the transmission power of the cellular terminal when the D2D communication pathloss is greater than a threshold value.

15. The mobile communication system according to claim 13, wherein

the shared radio resource is provided in an uplink radio resource of the cellular communication, and

the communication apparatus performs a transmission power control so as to increase the transmission power of the D2D terminal when the D2D communication pathloss is smaller than the threshold value.

16. The mobile communication system according to claim 13, wherein

the shared radio resource is provided in a downlink radio resource of the cellular communication, and

the communication apparatus performs a transmission power control so as to increase the transmission power of the D2D terminal when the D2D communication pathloss is smaller than the threshold value.

17. The mobile communication system according to claim 13, wherein

the shared radio resource is provided in a downlink radio resource of the cellular communication, and

the communication apparatus performs a transmission power control so as to increase the transmission power of the base station when the D2D communication pathloss is greater than the threshold value.

18. A D2D terminal capable of performing D2D communication by using a shared radio resource shared with cellular communication in a mobile communication system that supports the cellular communication in which a data path passes through a core network and the D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the terminal comprising:

a controller configured to notify a communication apparatus of information on a D2D communication pathloss that is a pathloss between the D2D terminal and another D2D terminal that is a communication partner of the D2D terminal.

19. A communication apparatus used in a mobile communication system that supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network, the apparatus comprising

a controller configured to control transmission power of at least one of a cellular terminal, the communication apparatus, and the D2D terminal, on the basis of information on a D2D communication pathloss that is a pathloss between the D2D terminal and another D2D terminal that is a communication partner of the D2D terminal.