Method and apparatus for power control and multiplexing for device to device communication in wireless cellular communication system

• US 9,480,026 B2
• Filed: 02/18/2014
• Issued: 10/25/2016
• Est. Priority Date: 02/15/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kwak, Yongjun, Cho, Joonyoung, Ji, Hyoungju, Ro, Sangmin
• Primary Examiner(s): Pham, Brenda H
• Application Number:
  US14/182,924
• Publication Number:
  US 20140233476A1
• Time in Patent Office: 980 Days
• Field of Search: 455/13.4, 455/17, 370/310.2, 370/328, 370/338, 370/235
• US Class Current: 1/1
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method of controlling power of a user equipment for device to device communication in a wireless communication system, and a user equipment thereof, are provided. The method includes receiving power control related information of the D2D communication from a Base Station (BS), determining transmission power of the UE based on maximum available power of the UE and the received power control related information of the D2D communication, and transmitting data according to the determined transmission power.

Claims

1. A method of controlling power of a User Equipment (UE) for Device to Device (D2D) communication in a wireless communication system, the method comprising:

receiving, at the UE, power control related information of the D2D communication from a Base Station (BS);

determining, by the UE, a first transmission power of the UE based on a maximum available transmission power of the UE;

determining, by the UE, a second transmission power of the UE based on a reception power of the BS and the power control related information; and

transmitting data, from the UE, according to a smaller transmission power from among the first transmission power and the second transmission power.

2. The method of claim 1, wherein the D2D communication comprises at least one of a discovery operation, transmission of control information, and transmission of data information.

3. The method of claim 1, further comprising:

determining a minimum transmission power of the UE between the first transmission Power and the second transmission power.

4. The method of claim 1, wherein the second transmission power is determined as a sum of the reception power set by a higher layer, a path loss according to a distance between the UE performing the D2D communication and the BS, and a number of resource blocks of a transmitted D2D channel.

5. The method of claim 4, wherein the path loss is assigned by a predetermined weight.

6. A User Equipment (UE) controlling power for Device to Device (D2D) communication in a wireless communication system, the UE comprising:

a transceiver configured to transmit and receive signals; and

controller configured to control the transceiver to receive power control related information of the D2D communication from a Base Station (BS), determine a first transmission power of the UE based on a maximum available transmission power of the UE, determine a second transmission power of the UE based on a reception power of the BS and the power control related information, and transmit data according to a smaller transmission power from among the first transmission power and the second transmission power.

7. The UE of claim 6, wherein the D2D communication comprises at least one of a discovery operation, transmission of control information, and transmission of data information.

8. The UE of claim 6, wherein the controller is further configured to determine a minimum transmission power of the UE between the first transmission power and the second transmission power.

9. The UE of claim 6, wherein the second transmission power is determined as a sum of the reception power set by a higher layer, a path loss according to a distance between the UE performing the D2D communication and the BS, and a number of resource blocks of a transmitted D2D channel.

10. The UE of claim 9, wherein the path loss is assigned by a predetermined weight.

11. A method of controlling power of a User Equipment (UE) for Device to Device (D2D) communication in a wireless communication system, the method comprising:

receiving transmission related information of the D2D communication from a Base Station (BS);

determining whether a transmission subframe of cellular information to be transmitted to the BS is a subframe allowing the D2D communication based on the transmission related information;

determining transmission power by using a first offset value included in the transmission related information when the transmission subframe is the subframe allowing the D2D communication as a result of the determination; and

transmitting the cellular information to the BS according to the determined transmission power.

12. The method of claim 11, wherein determining the transmission power comprises determining the transmission power by using a second offset value included in the transmission related information when the transmission subframe of the cellular information is not the subframe allowing the D2D communication as the result of the determination.

13. The method of claim 11, wherein receiving the transmission related information comprises receiving the transmission related information through at least one of system information, higher layer signaling, and physical layer control information.

14. A User Equipment (UE) controlling power for D2D communication in a wireless communication system, the UE comprising:

a transceiver configured to transmit and receive signals; and

a controller configured to control the transceiver to receive transmission related information of the D2D communication from the BS, determine whether a transmission subframe of cellular information to be transmitted to the BS is a subframe allowing the D2D communication based on the transmission related information, determine transmission power by using a first offset value included in the transmission related information when the transmission subframe is the subframe allowing the D2D communication as a result of the determination, and transmit the cellular information to the BS according to the determined transmission power.

15. The UE of claim 14, wherein the controller is further configured to determine the transmission power by using a second offset value included in the transmission related information when the transmission subframe of the cellular information is not the subframe allowing the D2D communication as the result of the determination.

16. The UE of claim 14, wherein the controller is further configured to receive the transmission related information through at least one of system information, higher layer signaling, and physical layer control information.

17. A method of controlling power of a User Equipment (UE) by a base station (BS) for Device to Device (D2D) communication in a wireless communication system, the method comprising:

transmitting, at the base station, power control related information of the D2D communication to the UE; and

receiving data, from the UE, according to a smaller transmission power from among a first transmission power of the UE and a second transmission power of the UE,

wherein the first transmission power of the UE is determined based on a maximum available transmission power of the UE, and

wherein the second transmission power of the UE is determined based on a reception power of the BS and the power control related information.

18. The method of claim 17, wherein the D2D communication comprises at least one of a discovery operation, transmission of control information, and transmission of data information.

19. The method of claim 17, the UE is configured to determine a minimum transmission power of the UE between the first transmission power and the second transmission power.

20. The method of claim 17, wherein the second transmission power is determined as a sum of the reception power set by a higher layer, a path loss according to a distance between the UE performing the D2D communication and the BS, and a number of resource blocks of a transmitted D2D channel.

21. The method of claim 20, wherein the path loss is assigned by a predetermined weight.

22. A base station (BS) controlling power for Device to Device (D2D) communication of a User Equipment (UE) in a wireless communication system, the BS comprising:

a transceiver configured to transmit and receive signals; and

a controller configured to control the transceiver to transmit power control related information of the D2D communication to the UE, and receive data from the UE according to a smaller transmission power from among a first transmission power of the UE and a second transmission power of the UE,

wherein the first transmission power of the UE is determined based on a maximum available transmission power of the UE, and

wherein the second transmission power of the UE is determined based on a reception power of the BS and the power control related information.

23. The BS of claim 22, wherein the D2D communication comprises at least one of a discovery operation, transmission of control information, and transmission of data information.

24. The BS of claim 22, wherein the UE is configured to determine a minimum transmission power of the UE between the first transmission power and the second transmission power.

25. The BS of claim 22, wherein the second transmission power is determined as a sum of the reception power set by a higher layer, a path loss according to a distance between the UE performing the D2D communication and the BS, and a number of resource blocks of a transmitted D2D channel.

26. The BS of claim 25, wherein the path loss is assigned by a predetermined weight.