Method and apparatus for controlling transmission power of device-to-device communication network

Patent metadata

Field	Value
Publication number	US-9538484-B2
Application number	US-201414765996-A
Country	US
Kind code	B2
Filing date	Feb 7, 2014
Priority date	Feb 7, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

The present invention is to provide a method and device for controlling transmission power by taking comprehensive consideration not only of the effect received onto itself in each device-to-device (D2D) link of a D2D communication network but also of the effect exerted onto the neighboring links. According to an embodiment of the present invention, a processing method in a transmission terminal of a first link for controlling the transmission power of the transmission terminals of links in a D2D communication network, which includes terminals of at least the first link and terminals of a second link adjacent to the first link includes: measuring the strengths of first detection signals transmitted from reception terminals of the first link and the second link; and determining a first transmission power adjustment ratio for the transmission terminal of the first link so that a signal-to-interference ratio of the second link is greater than or equal to a predetermined threshold value on the basis of the measured strengths of the first detection signals.

First claim

The invention claimed is:

1. A method, which is performed by a transmission terminal of a first link, for controlling transmission power of transmission terminals of links in a device to device (D2D) communication network, the method comprising:
measuring a strength of a first signal transmitted from a first reception terminal of the first link and a strength of a second signal transmitted from a second reception terminal of a second link; and
determining a first transmission power adjustment ratio for the transmission terminal of the first link so that a signal-to-interference ratio of the second link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

2. The method of claim 1 , wherein the first transmission power adjustment ratio includes an upper limit value of the first transmission power adjustment ratio.

3. The method claim 1 , further comprising:
determining a second transmission power adjustment ratio for a transmission terminal of the second link so that the signal-to-interference ratio of the second link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

4. The method of claim 1 , further comprising:
receiving, from the first reception terminal of the first link, a control message including a third transmission power adjustment ratio for the transmission terminal of the first link so that the signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value,
wherein the third transmission power adjustment ratio is determined based on a measurement result of a strength of a third signal transmitted from the transmission terminal of the first link and a strength of a fourth signal transmitted from the transmission terminal of the second link.

5. A transmission terminal of a first link for controlling transmission power of transmission terminals of links in a device to device (D2D) communication network, the transmission terminal comprising:
a transceiver configured to measure a strength of a first signal transmitted from a first reception terminal of the first link and a strength of a second signal transmitted from a second reception terminal of a second link; and
a controller configured to determine a first transmission power adjustment ratio for the transmission terminal of the first link so that a signal-to-interference ratio of the second link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

6. The transmission terminal of claim 5 , wherein the first transmission power adjustment ratio includes an upper limit value of the first transmission power adjustment ratio.

7. The transmission terminal of claim 5 , wherein the controller is further configured to determine a second transmission power adjustment ratio for a transmission terminal of the second link so that the signal-to-interference ratio of second link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

8. The transmission terminal of claim 5 ,
wherein the transceiver is further configured to receive, from the first reception terminal of the first link, a control message including a third transmission power adjustment ratio for the transmission terminal of the first link so that the signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value, and
wherein the third transmission power adjustment ratio is determined based on a measurement result of a strength of a third signal transmitted from the transmission terminal of the first link and a strength of a fourth signal transmitted from a transmission terminal of the second link.

9. A method, which is performed by a reception terminal of a first link, for controlling transmission power of transmission terminals of links in a device to device (D2D) communication network, the method comprising:
measuring a strength of a first signal transmitted from a first transmission terminal of the first link and a strength of a second signal transmitted from a second transmission terminal of a second link; and
determining a first transmission power adjustment ratio for the first transmission terminal of the first link so that a signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

10. The method of claim 9 , wherein the first transmission power adjustment ratio includes a lower limit value of the first transmission power adjustment ratio.

11. The method claim 9 , further comprising:
determining a second transmission power adjustment ratio for the second transmission terminal of the second link so that a signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

12. A reception terminal of a first link for controlling transmission power of transmission terminals of links in a device to device (D2D) communication network, the reception terminal comprising:
a transceiver configured to measure a strength of a first signal transmitted from a first transmission terminal of the first link and a strength of a second signal transmitted from a second transmission terminal of a second link; and
a controller configured to determine a first transmission power adjustment ratio for the transmission terminal of the first link so that a signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value based on the measured strength of the first signal and the measured strength of the second signal.

13. The reception terminal of claim 12 , wherein the first transmission power adjustment ratio includes a lower limit value of the first transmission power adjustment ratio.

14. The reception terminal of claim 12 , wherein the controller is further configured to determine a second transmission power adjustment ratio for the second transmission terminal of the second link so that the signal-to-interference ratio of the first link is greater than or equal to a predetermined threshold value, based on the measured strength of the first signal and the measured strength of the second signal.

15. A method, which is performed by a controller device, for controlling transmission power of transmission terminals in a device to device (D2D) communication network which includes terminals of multiple links adjacent to each other and the controller device, the method comprising:
receiving, from each of the transmission terminals, a control message including a yield indicator so that a signal-to-interference ratio of a link of a terminal transmitting the control message and a signal-to-interference ratio of neighboring links are greater than or equal to a predetermined threshold value;
selecting a link for a transmission power adjustment from among the multiple links;
determining a transmission power adjustment ratio for a transmission terminal associated with the selected link using the yield indicator; and
transmitting the determined transmission power adjustment ratio to the transmission terminal associated with the selected link.

16. The method of claim 15 , wherein the yield

Assignees

• Samsung Electronics Co Ltd
• Res And Business Found Sungkyunkwan Univ
• Univ Sungkyunkwan Res & Bus

Inventors

• Ryu Hyun-Seok
• Chung Min-Young
• Kim Dong-Hyun
• Bae Sueng-Jae
• Kim Kyung-Kyu
• Kim Dae-Gyun
• Park Seung-Hoon
• Lim Chi-Woo

Classifications

• H04W76/14

  Direct-mode setup · CPC title

• H04W52/245 Primary

  taking into account received signal strength · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W52/243

  taking into account interferences · CPC title

• H04W52/383

  power control in peer-to-peer links · CPC title