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1. (WO2009128604) METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK CONTROL INFORMATION

Pub. No.:    WO/2009/128604    International Application No.:    PCT/KR2009/000338
Publication Date: Oct 22, 2009 International Filing Date: Jan 22, 2009
IPC: H04B 7/04
Applicants: LG ELECTRONICS INC.
LEE, Moon Il
CHUNG, Jae Hoon
KO, Hyun Soo
IHM, Bin Chul
LEE, Wook Bong
CHUN, Jin Young
Inventors: LEE, Moon Il
CHUNG, Jae Hoon
KO, Hyun Soo
IHM, Bin Chul
LEE, Wook Bong
CHUN, Jin Young
Title: METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK CONTROL INFORMATION
Abstract:
A method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at an base station, receiving feedback information including a precoding matrix index (PMI) from an user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The precoding information of a predetermined transmission mode in the precoding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE. At this time, if the confirmation information is transmitted via a specific resource block (RB) of an nth subframe, the PMI which is recently received is received via a resource block of an n-xth subframe or a subframe prior to the n-xth subframe corresponding to the specific resource block. In addition, "x" is a predetermined integer or an integer determined by upper layer signaling of a physical layer or higher.