Apparatus and method for supporting transmission of sounding reference signals from multiple antennas
Methods and apparatuses, through the use of a Downlink Control Indication (DCI) format or through higher layer signaling, for dynamic activation and deactivation of Sounding Reference Signal (SRS) transmissions from User Equipments (UEs) in an UL Component Carrier (CC) with configured SRS transmissions, the dynamic configuration of SRS transmissions parameters, the dynamic activation and configuration of SRS transmissions in an UL CC without previously configured SRS transmissions for a reference UE, and the configuration of SRS transmissions from multiple UE transmitter antennas.
1. A method for controlling reference signal (RS) transmission of a user equipment (UE) by a base station in a wireless communication system, the method comprising:
transmitting, to the UE, downlink control information (DCI) including RS request information,
wherein the RS request information includes two binary elements, if data transmission is based on multiple UE transmission antennas,
wherein the RS request information includes one binary element, if the data transmission is based on a single UE transmission antenna, and
wherein, if an RS transmission triggered by the RS request information is to occur in a same subframe as an RS transmission previously configured to the UE from the base station, the UE transmits the RS triggered by the RS request information.
2. The method of claim 1 , wherein the UE transmits the RS once.
3. The method of claim 1 , wherein parameters for the RS transmission are configured to the UE from the base station through higher layer signaling.
4. A method for controlling reference signal (RS) transmission of a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, downlink control information (DCI) including RS request information,
wherein the RS request information includes two binary elements, if data transmission is based on multiple UE transmission antennas,
wherein the RS request information includes one binary element, if the data transmission is based on a single UE transmission antenna, and
wherein, if an RS transmission triggered by the RS request information is to occur in a same subframe as an RS transmission previously configured to the UE from the base station, the UE transmits the RS triggered by the RS request information.
5. The method of claim 4 , wherein the UE transmits the RS once.
6. The method of claim 4 , wherein parameters for the RS transmission are configured to the UE from the base station through higher layer signaling.
7. A base station in a wireless communication system, the base station comprising:
a transceiver for transmitting, to a user equipment (UE), downlink control information (DCI) including reference signal (RS) request information,
wherein the RS request information includes two binary elements, if data transmission is based on multiple UE transmission antennas,
wherein the RS request information includes one binary element, if the data transmission is based on a single UE transmission antenna, and
wherein, if an RS transmission triggered by the RS request information is to occur in a same subframe as an RS transmission previously configured to the UE from the base station, the UE transmits the RS triggered by the RS request information.
8. The base station of claim 7 , wherein the UE transmits the RS once.
9. The base station of claim 7 , wherein parameters for the RS transmission are configured to the UE from the base station through higher layer signaling.
10. A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver for receiving, from a base station, downlink control information (DCI) including reference signal (RS) request information,
wherein the RS request information includes two binary elements, if data transmission is based on multiple UE transmission antennas,
wherein the RS request information includes one binary element, if the data transmission is based on a single UE transmission antenna, and
wherein, if an RS transmission triggered by the RS request information is to occur in a same subframe as an RS transmission previously configured to the UE from the base station, the UE transmits the RS triggered by the RS request information.
11. The UE of claim 10 , wherein the UE transmits the RS once.
12. The UE of claim 10 , wherein parameters for the RS transmission are configured to the UE from the base station through higher layer signaling.