Single frequency network transmission procedure based on sounding reference signals

A method for wireless communication at a second cell, comprising:

• receiving, from a first cell capable of transmitting a single frequency network transmission to a user equipment (UE) with the second cell, a measurement request indicating that the second cell is to perform measurements on sounding reference signals received from the UE;
• receiving the sounding reference signals from the UE based at least in part on the received measurement request;
• performing the measurements on the sounding reference signals received from the UE;
• and
• transmitting the single frequency network transmission to the UE synchronously with the first cell based at least in part on the measurements.

An apparatus for wireless communication at a first cell, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit a control message to a user equipment (UE) indicating that the UE is to transmit sounding reference signals;
• transmit, based at least in part on transmitting the control message, a measurement request to one or more second cells capable of transmitting a single frequency network transmission to the UE with the first cell, the measurement request indicating for the one or more second cells to perform measurements on the sounding reference signals;
• select a subset of the one or more second cells to include in a single frequency network cell group for the single frequency network transmission based at least in part on transmitting the measurement request;
• and
• transmit the single frequency network transmission to the UE synchronously with the selected subset of the one or more second cells based at least in part on transmitting the measurement request.

An apparatus for wireless communication at a second cell, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a first cell capable of transmitting a single frequency network transmission to a user equipment (UE) with the second cell, a measurement request indicating that the second cell is to perform measurements on sounding reference signals received from the UE;
• receive the sounding reference signals from the UE based at least in part on the received measurement request;
• perform the measurements on the sounding reference signals received from the UE;
• and
• transmit the single frequency network transmission to the UE synchronously with the first cell based at least in part on the measurements.