Patent ID: 9264196
Filing Date: 2016-02-16
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; and transmitting, by the base station to the user equipment, the multiple types of RSs in a plurality of subframes, wherein first type RSs for N number of antenna ports are transmitted in all of the plurality of subframes, wherein the second type RSs for M−N number of antenna ports are transmitted at least one subframe among the plurality of subframes, where N<M, wherein the configuration information of the second type RSs includes configuration information specifying the at least one subframe for an occurrence of the second type RSs.