BACKGROUND OF THE INVENTION

1. Field of the Invention

An embodiment of the present specification relates to a wireless mobile communication system, and in particular, to a UE operation including a transmission power control procedure and a multiplexing procedure of the UE in a system where a device-to-device communication technology and a wireless cellular communication technology are used together, and to a base station operation corresponding thereto and an apparatus thereof.

2. Description of the Related Art

A device to device (D2D) communication technique which allows direct communication with another UE existing around the UE has emerged to provide a more efficient service using a wireless mobile communication system. A device to device communication technology may perform device to device communication through a discovery operation by a UE for discovering what kind of UEs are present around the UE and through a direct communication operation by the UE with a UE necessary for communication. As such, when the direct communication is performed by the device to device communication, a relatively small amount of wireless resource can be used in comparison with the communication using the conventional wireless network and a base station, and thus the wireless resource efficiency is improved. In addition, since a method for discovering UEs around the UE is supported, information required in accordance with the position of the UE and characteristics thereof can be provided to each UE, and thus new services such as an advertisement service, a Social Networking Service (hereinafter, referred to as SNS), etc. can be created and service efficiency thereby can be improved. Currently, a Long Term Evolution Advanced (hereinafter, LTE-A) system also requires support for the device to device technology and technical discussions therefor are under way.

The device to device communication may communicate using the same frequency band as does a conventional cellular communication which uses a base station. When the device to device communication uses the same frequency band as does the cellular communication, communication can be performed by dividing the communication on a time and frequency axis in order to solve a mutual interference problem. However, when a UE performs the conventional cellular communication, control information such as ACK/NACK, Scheduling Request (SR), Channel Quality Indicator (CQI), etc. can be periodically transmitted to the base station so that the frequency multiplexing may be required between the device to device communication and the cellular communication as well as multiplexing on a time axis. At this time, when the UE performing the device to device communication performs data transmission using an arbitrary transmission power, a problem may occur where in-band emission power thereby can provide a relatively larger noise impact to other UEs than the D2D UE which should receive the transmission. Thus, in a case where the device to device communication technology and the wireless communication technology are used together, in-band emission power due to the D2D signal transmission by the UE using the D2D technology in a system may cause a problem of noise in a cellular transmission, and thus the study for the situation is required.

SUMMARY OF THE INVENTION

The present invention is made to address the above-mentioned problem.

According to an embodiment of the present disclosure, provided is a method performed by a terminal in a communication system, the method including: receiving, from a base station, configuration information for one or more discovery resources, the configuration information including time and frequency resource information and threshold information for a reception signal power for each of the one or more discovery resources; measuring reception signal power in resources associated with discovery resources; selecting a discovery resource among the one or more discovery resources based on the measured reception signal power and the threshold information; and transmitting a discovery signal using the selected discovery resource.

According to another embodiment of the present disclosure, provided is a method performed by a base station in a communication system, the method including identifying one or more discovery resources and corresponding time and frequency resource and threshold information associated with a reception signal power for selecting a discovery resource for transmitting a discovery signal; and transmitting, to a terminal, configuration information for the one or more discovery resources, the configuration information including time and frequency resource information and threshold information for each of the one or more discovery resources, wherein the discovery resource is selected among the one or more discovery resources based on a measured reception signal power by the terminal and the threshold information, and

According to a further embodiment of the present disclosure, a terminal in a communication system is provided, the terminal including a transceiver and a controller coupled with the transceiver. The controller is configured to receive, from a base station via the transceiver, configuration information for one or more discovery resources, the configuration information including time and frequency resource information and threshold information for a reception signal power for each of the one or more discovery resources, measure reception signal power in resources associated with discovery resources, select a discovery resource among the one or more discovery resources based on the measured reception signal power and the threshold information, and transmit a discovery signal using the selected discovery resource.

According to yet another embodiment of the present disclosure, a base station is provided in a communication system, the base station including a transceiver and a controller coupled with the transceiver. The controller is configured to identify one or more discovery resources and corresponding time and frequency resource and threshold information associated with a reception signal power for selecting a discovery resource for transmitting a discovery signal, and transmit, to a terminal via the transceiver, configuration information for the one or more discovery resources, the configuration information including time and frequency resource information and threshold information for each of the one or more discovery resources, wherein the discovery resource is selected among the one or more discovery resources based on a measured reception signal power by the terminal and the threshold information, and wherein the discovery signal is transmitted using the selected discovery resource.

