Positioning of passive internet of things (IOT) devices

A method of wireless communication at a wireless device, comprising:

• transmitting an indication of a positioning session to an Internet of Things (IoT) device, wherein the indication initiates the positioning session for the IoT device;
• transmitting, based on the positioning session, a set of positioning reference signals (PRSs) to the IoT device via a plurality of transmission occasions;
• receiving, from the IoT device based on a reflection pattern, at least one PRS in the set of PRSs via at least one reception occasion;
• and
• calculating a position of the IoT device or a distance between the wireless device and the IoT device based on a round-trip time (RTT) of the at least one PRS in the set of PRSs, wherein the RTT is calculated based on tRTT=2*tbias+2*d/c, d being the distance between the wireless device and the IoT device, tRTT being the RTT of the at least one PRS, tbias being a bias associated with transmitting and receiving one or more PRSs, and c being a speed of light.

An apparatus for wireless communication at a wireless device, comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory and the at least one processor is configured to:
• transmit an indication of a positioning session to a plurality of Internet of Things (IoT) devices, wherein the indication includes at least one of:
• a reflection pattern, a format for a set of positioning reference signals (PRSs), a duration for transmitting the set of PRSs, a number of repetitions for the set of PRSs, a number of transmission occasions for the set of PRSs, or one or more modes associated with reflection operations of the set of PRSs;
• receive an acknowledgement from an IoT device in the plurality of Internet of Things (IoT) devices to participate the positioning session;
• select at least the IoT device among the plurality of IoT devices for the positioning session;
• transmit, based on the positioning session, the set of PRSs to the IoT device via the plurality of transmission occasions;
• and
• receive, from the IoT device based on the reflection pattern, at least one PRS in the set of PRSs via at least one reception occasion.

A method for wireless communication at a wireless device, comprising:

• transmitting an indication of a positioning session to a plurality of Internet of Things (IoT) devices, wherein the indication includes at least one of:
• a reflection pattern, a format for a set of positioning reference signals (PRSs), a duration for transmitting the set of PRSs, a number of repetitions for the set of PRSs, a number of transmission occasions for the set of PRSs, or one or more modes associated with reflection operations of the set of PRSs;
• receiving an acknowledgement from an IoT device in the plurality of Internet of Things (IoT) devices to participate the positioning session;
• selecting at least the IoT device among the plurality of IoT devices for the positioning session;
• transmitting, based on the positioning session, the set of PRSs to the IoT device via the plurality of transmission occasions;
• and
• receiving, from the IoT device based on the reflection pattern, at least one PRS in the set of PRSs via at least one reception occasion.