Patent ID: 9363058
Filing Date: 2016-06-07
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for transmitting multiple types of Reference Signals (RSs) in an Orthogonal Frequency Division Multiplex (OFDM) system, the method comprising: transmitting, by a base station to a user equipment, configuration information of second type RSs; transmitting, by the base station to the user equipment, M number of RSs in at least one first type subframe, wherein the M number of RSs include first type RSs for N number of antenna ports and the second type RSs for M−N number of antenna ports, where N<M; and transmitting, by the base station to the user equipment, the first type RSs for the N number of antenna ports other than the second type RSs in at least one second type subframe, wherein the configuration information of the second type RSs includes configuration information indicating which subframe is the at least one first type subframe in which the second type RSs are transmitted.