Apparatus and method for radio link monitoring in a wireless communication system

A radio link monitoring apparatus of a user equipment (UE) communicating with a network in which a base station (BS) and at least one remote radio head (RRH) coexist within a cell, the radio link monitoring apparatus comprising:

• a receiver configured to:
• receive reference signal configuration information (RSCI) from the network to which the UE belongs, the RSCI including information indicating to at least two reference signal (RS) types which are used for a monitoring RS (MRS) among a plurality of RS types, information indicating a first RS type used by the UE to determine an unreliable radio link state, information indicating a second RS type used by the UE to determine a reliable radio link state, and information related to a plurality of different time points respectively corresponding to the plurality of RS types, and
• receive at least two RSs transmitted from at least one of the BS or the at least one RRH at a time point, based on the RSCI;
• and
• a radio link monitor configured to monitor radio link using the received at least two RSs, and obtain a monitoring result per the received at least two RSs,
• wherein an RS type is determined based on whether the RS is transmitted by the BS or the at least one RRH,
• wherein the radio link monitor obtains the monitoring result per the received at least two RSs by:
• obtaining a first monitoring result by monitoring a channel state information (CSI)-RS;
• determining whether the first monitoring result satisfies a lowest threshold;
• obtaining a second monitoring result by monitoring a common RS (CRS) in case that the first monitoring result does not satisfy the lowest threshold;
• determining whether the second monitoring result satisfies the lowest threshold;
• and
• determining that the UE is in the unreliable radio link state in case that the second monitoring result does not satisfy the lowest threshold,
• wherein the at least two RS types includes the first RS type and the second RS type, and
• wherein the received at least two RSs include at least one RS corresponding to the first RS type and at least one RS corresponding to the second RS type.