Abstract:
Disclosed is a transmission power managing method of a heterogeneous network system, including: determining, when a first terminal communicates with a second terminal by using a first D2D transmission power value through a first communication network, whether a first cellular transmission power value of a third terminal satisfying a quality condition of the third terminal which communicates with a base station through a second communication network exists; determining, when the first cellular transmission power value exists and the third terminal communicates with the base station by using the first cellular transmission power value, whether a second D2D transmission power value of the first terminal satisfying a quality condition of the second terminal exists; and updating, by the first terminal, the first D2D transmission power value to the second D2D transmission power value when the second D2D transmission power value exists.
Abstract:
An operation method of a UE in a communication system includes receiving, from a base station, a security mode command message including information requesting reporting of capability information and security configuration information; identifying the security configuration information included in the security mode command message; and transmitting, to the base station, a security mode complete message including the capability information requested by the security mode command message.
Abstract:
According to the present invention, a method of performing coordinated multi-point transmission and reception in an overlaid cellular system in which a first base station and a second base station overlay each other, the method comprising performing a handover using a coordinated multi-point transmission and reception scheme based on CRS-RS (Channel State Indicator-Reference Signal) information of user equipment by the first and second base stations.