METHOD AND APPARATUS FOR TRIGGERING APERIODIC FEEDBACK IN COORDINATED MULTIPOINT TRANSMISSION

摘要

Embodiments of the present invention provide a method and apparatus for triggering aperiodic feedback in coordinated multipoint transmission. The method includes: transmitting, by an eNB to UE, dynamic control information (DCI) and preconfigured feedback sets corresponding to the DCI, so that the UE aperiodically feeds back corresponding channel state information (CSI) according to the DCI and the feedback sets corresponding to the DCI; wherein the preconfigured feedback sets corresponding to the DCI are classified according to a triggered transmitting point or a CSI-RS of non-zero power, or are classified according to configured CSI, or are classified according to an interference type. With the method and apparatus of the embodiments of the present invention, a relatively good tradeoff between flexibility of aperiodic CSI feedback and signaling load in a CoMP transmission process or a joint transmission process of CoMP and CA may be achieved.

主权项

1. An eNB, configured to trigger a User Equipment (UE) to aperiodically feed back Channel State Indication (CSI), the eNB comprising:
a transmitter configured to transmit to the UE which is configured in Coordinated Multipoint Transmission (CoMP) mode, downlink control information and feedback sets corresponding to the downlink control information preconfigured via Radio Resource Control (RRC) signaling, so that the UE aperiodically feeds back corresponding CSI according to the downlink control information and the feedback sets corresponding to the downlink control information; wherein the feedback sets corresponding to the downlink control information preconfigured via RRC signaling are classified according to configured CSI,wherein 1 bit information or 2 bit information is used in a CSI request field in the downlink control information for uplink transmission;
when the CSI request field is 1 bit information, the feedback sets is one feedback set corresponding to a value of the CSI request field 1; and when the CSI request field is 2 bit information, the feedback sets are three feedback sets corresponding respectively to values of the CSI request field01, 10 and 11, or the feedback sets are two feedback sets corresponding respectively to the values of the CSI request field 10 and 11.