A method for transmitting a channel state information reference signal, CSI-RS in the following, said method comprising: identifying a location of one or more CSI-RS subframes that are configured to transmit one or more CSI-RS reuse patterns; identifying a location of one or more resource elements, REs, for transmitting the CSI-RS within the one or more CSI-RS subframes, wherein the REs that comprise the one or more CSI-RS reuse patterns are specified by a number of CSI-RS ports, designated either N ANT or N CSIRS, and an RE #0 location, either < k r,0, l r,0 > or 〈 k', l', n s 〉, in the one or more CSI-RS reuse patterns, where k r,0 is a subcarrier offset of the RE #0 location, l r,0 is a symbol offset of the RE #0 location, k' is a subcarrier index, l' is an OFDM symbol index, n s is a slot index, and wherein the CSI-RS subframe is specified by a frame index n f and the slot index n s, where 0 ≤ n s < 20, that satisfies (10× n f + └ n s /2┘-Δ CSIRS)mod T CSIRS = 0, where T CSIRS and Δ CSIRS are signaled to a user equipment, UE, by a high-layer radio resource control parameter I CSIRS, based upon a predefined table; and generating CSI-RS modulation symbols in the one or more CSI-RS REs where each symbol contains a CSI-RS sequence element r l, n S ( m') as a multiplication component, wherein the relation between the index m' of CSI-RS sequence element r l, n S ( m') and frequency-domain index m of physical resource block, PRB, containing the CSI-RS RE to which the CSI-RS sequence element is mapped, is given by m ′ = m + ⌊ N RB max, DL − N RB DL 2 ⌋ m' where m is an integer ranging from 0 to N RB DL − 1, N RB DL is the actual system bandwidth in number of PRB, and N RB max, DL is the maximum supported bandwidth in number of PRB. identifying a location of one or more CSI-RS subframes that are configured to transmit one or more CSI-RS reuse patterns; identifying a location of one or more resource elements, REs, for transmitting the CSI-RS within the one or more CSI-RS subframes, wherein the REs that comprise the one or more CSI-RS reuse patterns are specified by a number of CSI-RS ports, designated either N ANT or N CSIRS, and an RE #0 location, either < k r,0, l r,0 > or 〈 k', l', n s 〉, in the one or more CSI-RS reuse patterns, where k r,0 is a subcarrier offset of the RE #0 location, l r,0 is a symbol offset of the RE #0 location, k' is a subcarrier index, l' is an OFDM symbol index, n s is a slot index, and wherein the CSI-RS subframe is specified by a frame index n f and the slot index n s, where 0 ≤ n s < 20, that satisfies (10× n f + └ n s /2┘-Δ CSIRS)mod T CSIRS = 0, where T CSIRS and Δ CSIRS are signaled to a user equipment, UE, by a high-layer radio resource control parameter I CSIRS, based upon a predefined table; and generating CSI-RS modulation symbols in the one or more CSI-RS REs where each symbol contains a CSI-RS sequence element r l, n S ( m') as a multiplication component, wherein the relation between the index m' of CSI-RS sequence element r l, n S ( m') and frequency-domain index m of physical resource block, PRB, containing the CSI-RS RE to which the CSI-RS sequence element is mapped, is given by m ′ = m + ⌊ N RB max, DL − N RB DL 2 ⌋ m' where m is an integer ranging from 0 to N RB DL − 1, N RB DL is the actual system bandwidth in number of PRB, and N RB max, DL is the maximum supported bandwidth in number of PRB.