Communication device, transmission power control method, and program

• US 10,306,564 B2
• Filed: 08/28/2017
• Issued: 05/28/2019
• Est. Priority Date: 08/06/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sawai, Ryo, Kimura, Ryota
• Primary Examiner(s): Alam, Fayyaz
• Application Number:
  US15/688,081
• Publication Number:
  US 20170359785A1
• Time in Patent Office: 638 Days
• Field of Search: 455522, 455 69- 70, 455 6711, 455 631, 455516, 455517, 455447, 455448, 455454, 4554561, 4554562
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

There is provided a communication device including: a communication unit that receives a beacon for a second communication service making secondary usage of a spectrum assigned to a first communication service; and a control unit that controls a transmission power to be used for transmission of a radio signal of the second communication service from the communication unit based on location data included in the beacon and indicating a location of a transmission source node of the beacon and a location of an interfered node interfered by the second communication service.

Claims

1. A communication device comprising:

a communication unit to receive a first signal from a management node for a second communication service making secondary usage of a spectrum assigned to a first communication service; and

a control unit to control a transmission power to be used for transmission of a radio signal of the second communication service from the communication unit based on location information of the communication device and a radio signal quality used in the first communication service, wherein the radio signal quality is transmitted from the management node.

2. The communication device according to claim 1, wherein:

the control unit uses a different transmission power depending on whether a distance from an interfered node interfered by the second communication service to the communication device is longer or shorter than a distance from the interfered node to a transmission source node of the first signal for transmission of the radio signal from the communication unit.

3. The communication device according to claim 2, wherein:

when the distance from the interfered node to the communication device is longer than the distance from the interfered node to the transmission source node of the first signal, the control unit uses a transmission power equal to a transmission power of the first signal for transmission of the radio signal from the communication unit.

4. The communication device according to claim 2, wherein:

when the distance from the interfered node to the communication device is shorter than the distance from the interfered node to the transmission source node of the first signal, the control unit uses a transmission power lower than a transmission power of the first signal for transmission of the radio signal from the communication unit.

5. The communication device according to claim 4, wherein:

when there is a possibility that direct transmission of the radio signal from the communication unit to the transmission source node of the first signal causes interference on the interfered node, the control unit controls the communication unit to wait to transmit the radio signal until another node located between the transmission source node of the first signal and the communication device and relaying the radio signal is detected.

6. The communication device according to claim 5, wherein:

when said another node is detected, the control unit controls the communication unit to transmit the radio signal by using a transmission power at a level receivable by said another node.

7. The communication device according to claim 1, wherein:

when it is determined that the radio signal can be transmitted from the communication unit to a transmission source node of the first signal without causing interference on an interfered node interfered by the second communication service, the control unit controls the communication unit to relay a radio signal received from another node to the transmission source node of the first signal.

8. The communication device according to claim 7, wherein:

the second communication service is a service making secondary usage of a spectrum being used for uplink in the first communication service, among the spectrum assigned to the first communication service, and

the interfered node is a base station of the first communication service.

9. A transmission control method comprising:

receiving a first signal from a management node for a second communication service making secondary usage of a spectrum assigned to a first communication service;

acquiring location information of a communication device and a radio signal quality used in the first communication service, wherein the radio signal quality is transmitted from the management node; and

transmitting a radio signal for the second communication service by using a transmission power set based on the location information and the radio signal quality.