Method for transmitting and receiving a signal to protect against erroneous feedback information
View Patent ↗A method for providing precoding weights for data symbols of data control subframes includes generating a downlink frame having control subframes which individually correspond to one of a plurality of downlink data subframes, and inserting weight information into each of the control subframes, such that the weight information is to be applied to data symbols present in the corresponding one of the data subframes. The method further includes transmitting the control subframes and the inserted weight information to a receiving device.
1. A method for transmitting signals at a base station to a user equipment (UE) configured to operate in a multi input multi output (MIMO) mode, the method comprising:
receiving, from the UE, feedback information comprising weight information to be used for data transmission;
multiplying a weight and data to be transmitted, the weight being determined considering to the feedback information received from the UE;
transmitting the weight multiplied data to the UE through a specific physical downlink shared channel where a MIMO transmission scheme for a HS-DSCH (High Speed Downlink Shared Channel) is applied; and
transmitting feed-forward information, indicating the weight applied to the data when transmitted to the UE, through a downlink shared control channel when the data is transmitted using the MIMO transmission scheme for the HS-DSCH,
wherein the weight applied to the specific physical downlink shared channel is adjusted at a subframe boundary of the downlink shared control channel, and
wherein the feed-forward information, comprising the weight information indicating the weight applied to a specific subframe of the specific physical downlink shared channel, is transmitted through a subframe of the downlink shared control channel corresponding to the specific subframe of the specific physical downlink shared channel.
2. The method according to claim 1 , wherein the feed-forward information transmitted through one subframe of the downlink shared control channel comprises the weight information applied to 2 slots of the specific physical downlink shared channel received right before the one subframe.
3. The method according to claim 1 , wherein the downlink shared control channel is newly defined channel for transmitting the feed-forward information.
4. The method according to claim 1 , wherein a UE configured in a closed-loop transmit diversity mode 1 performs an antenna verification to receive the data from the base station.
5. The method according to claim 1 , wherein the MIMO transmission scheme for the HS-DSCH comprises a dual stream transmission scheme.
6. The method according to claim 5 , wherein the data is transmitted through a first stream and a second stream, and each of the first and the second streams is transmitted through two antennas.
7. A method for receiving signals at a user equipment (UE) configured to operate in a multi input multi output (MIMO) mode, the method comprising:
transmitting, to a base station, feedback information comprising weight information, the feedback information generated at the UL based on a received pilot signal;
receiving data, to which a weight is applied, from the base station through a specific physical downlink shared channel where a MIMO transmission scheme for a HS-DSCH (High Speed Downlink Shared Channel) is applied; and
receiving feed-forward information indicating the weight applied to the data at the base station when the data is received using the MIMO transmission scheme for the HS-DSCH,
wherein the weight is adjusted at a subframe boundary of the specific physical downlink shared channel, and
wherein the feed-forward information, comprising the weight information indicating the weight applied to a specific subframe of the specific physical downlink shared channel, is received through a subframe in a downlink shared control channel corresponding to the specific subframe of the specific physical downlink shared channel.
8. The method according to claim 7 , wherein a UE configured in a closed-loop transmit diversity mode 1 performs an antenna verification to receive the data from the base station.
9. The method according to claim 8 , wherein the MIMO transmission scheme for the HS-DSCH comprises a dual stream transmission scheme.
10. The method according to claim 9 , wherein the data is received through a first stream and a second stream, and each of the first and the second streams is received through two antennas.