Patent ID: 8565168

Claim:
In a communication system wherein a base station transmits a Downlink Control Information (DCI) format conveying a Scheduling Assignment (SA) to a User Equipment (UE), the DCI format including Information Elements (IEs) configuring transmission of data information from the UE to the base station, the IEs including binary elements, a method to activate transmission of Reference Signals (RSs) from the UE, the method comprising: including in the DCI format an “RS Activation” IE including two binary elements; and transmitting the DCI format in which the “RS Activation” IE is included to the UE, wherein, if the two binary elements of the “RS Activation” IE have a value ‘00’, the UE skips a transmission of an RS, wherein, if the two binary elements of the “RS Activation” IE have a value other than ‘00’, the UE transmits an RS, and wherein each value of the “RS Activation” IE other than ‘00’ indicates a respective set of parameters for an RS transmission.