Two-step fmcw transmission for channel measurement accuracy enhancement

An apparatus of wireless communication at a user equipment (UE), comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor is configured to:
• transmit, to a network node, a first reference signal, wherein the first reference signal is based on a first frequency-modulated continuous wave (FMCW) and has a first frequency bandwidth occupied by the first FMCW;
• receive, from the network node, an indication for a second reference signal, wherein the second reference signal is based on a second FMCW and has a second frequency bandwidth occupied by the second FMCW;
• and
• transmit, to the network node, the second reference signal, the second reference signal based on the second FMCW, wherein the second signal has a frequency location based on a first channel estimation for a channel between the UE and the network node based on the first reference signal, the second frequency bandwidth being smaller than the first frequency bandwidth.

An apparatus of wireless communication at a user equipment (UE), comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor is configured to:
• transmit, to a network node, a first reference signal, wherein the first reference signal is based on a first frequency-modulated continuous wave (FMCW) and has a first frequency bandwidth occupied by the first FMCW;
• and
• receive, from the network node, a second reference signal, wherein the second reference signal is based on a second FMCW and has a second frequency bandwidth occupied by the second FMCW, and wherein the second signal has a frequency location based on a first channel estimation for a channel between the UE and the network node based on the first reference signal, the second frequency bandwidth being smaller than the first frequency bandwidth.