Patent ID: 11894925
Assignee: NTT DOCOMO, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A communication method for a terminal among a terminal group comprising a plurality of terminals which is grouped in a cell, comprising:
receiving configuration information using radio resource control (RRC) signaling and an aperiodic Channel State Information Reference Signal (CSI-RS) to be used for the terminal group, and receiving a trigger signal using a downlink control information (DCI) field which indicates the aperiodic CSI-RS in a frequency domain in a bandwidth that is the same as a bandwidth for a time and frequency resource that is used for data transmission to the terminal;
if the trigger signal is received then, based on the received configuration information and the received trigger signal, specifying a time and frequency resource for the aperiodic CSI-RS from a plurality of time and frequency resources; and
performing rate matching related to the specified time and frequency resource based on the trigger signal, and if the trigger signal is not received and the configuration information is received, determining not to use the aperiodic CSI-RS.