Power control method for guaranteeing quality of service of device to device direct communication and apparatus therefor
First Claim
1. A power control method performed by a user equipment to assure quality of service of a device-to-device (D2D) communication, the power control method comprising:
- receiving, from a base station, information that includes at least one of channel information and information of a receiving side user equipment in the D2D communication;
estimating a channel gain value of an uplink channel based on the received information; and
selecting a transmission power by comparing the channel gain value of the uplink channel with a threshold value for determining a maximum transmission power, and transmitting data to the base station by using the selected transmission power,wherein when the channel gain value of the uplink channel is greater than or equal to the threshold value, the selected transmission power is determined to be a smaller value of a first transmission power and a maximum instantaneous power,wherein when the channel gain value of the uplink channel is smaller than the threshold value, the selected transmission power is determined to be a smaller value of a second transmission power and the maximum instantaneous power,wherein the threshold value is determined as a function of a probability of outage in the D2D communication, a received power of the D2D communication, and long term statistic information for the D2D communication, andwherein the channel information includes at least one of channel information of the D2D communication, uplink channel information between the user equipment and the base station, and interference channel information between the user equipment and the receiving side user equipment in the D2D communication.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a method of controlling, by a device, power for guaranteeing the quality of service of a device to device (D2D) direct communication. In detail, the method comprises the steps of: receiving, from a base station, information containing at least one of channel information and information of a receiving side device in a D2D communication; estimating an uplink channel with the base station on the basis of the received information; and selecting a transmission power by comparing the channel gain value of the uplink channel with a threshold value for determining the maximum transmission power, and transmitting data to the base station using the selected transmission power, wherein the channel information comprises at least one of channel information of the D2D communication, uplink channel information between the device and the base station, and interference channel information between the device and the receiving side device in the D2D communication.
10 Citations
10 Claims
-
1. A power control method performed by a user equipment to assure quality of service of a device-to-device (D2D) communication, the power control method comprising:
-
receiving, from a base station, information that includes at least one of channel information and information of a receiving side user equipment in the D2D communication; estimating a channel gain value of an uplink channel based on the received information; and selecting a transmission power by comparing the channel gain value of the uplink channel with a threshold value for determining a maximum transmission power, and transmitting data to the base station by using the selected transmission power, wherein when the channel gain value of the uplink channel is greater than or equal to the threshold value, the selected transmission power is determined to be a smaller value of a first transmission power and a maximum instantaneous power, wherein when the channel gain value of the uplink channel is smaller than the threshold value, the selected transmission power is determined to be a smaller value of a second transmission power and the maximum instantaneous power, wherein the threshold value is determined as a function of a probability of outage in the D2D communication, a received power of the D2D communication, and long term statistic information for the D2D communication, and wherein the channel information includes at least one of channel information of the D2D communication, uplink channel information between the user equipment and the base station, and interference channel information between the user equipment and the receiving side user equipment in the D2D communication. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A power control method performed by a user equipment to assure quality of service of a device-to-device (D2D) communication, the power control method comprising:
-
receiving, from a base station, information as to a transmission power for transmitting data; and transmitting the data to the base station by using the transmission power, wherein the transmission power is a value selected by the base station by comparing a channel gain value of an uplink channel, which is calculated based on at least one of channel information and information of a receiving side user equipment in the D2D communication, with a threshold value for determining a maximum transmission power, wherein when the channel gain value of the uplink channel is greater than or equal to the threshold value, the selected transmission power is determined to be a smaller value of a first transmission power and a maximum instantaneous power, wherein when the channel gain value of the uplink channel is smaller than the threshold value, the selected transmission power is determined as a smaller value of a second transmission power and the maximum instantaneous power, wherein the threshold value is determined as a function of a probability of outage in the D2D communication, a received power of the D2D communication, and long term statistic information for the D2D communication, and wherein the channel information includes at least one of channel information of the D2D communication, uplink channel information between the user equipment and the base station, and interference channel information between the user equipment and the receiving side user equipment in the D2D communication. - View Dependent Claims (8, 9, 10)
-
Specification