Positioning accuracy enhancements

A terminal device, comprising:

• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to perform:
• receiving, from a second location management device, first configuration information of a first set of passive radios for transmitting a plurality of first target signals in response to receiving a plurality of first reference signals from a network device,
• wherein the first configuration information comprises a first mapping of a first target signal to a first reference signal and a first time window for listening the plurality of first target signals,
• wherein the first mapping indicates a carrier of the first target signal, a bandwidth of the first target signal, a waveform of the first target signal, a time pattern of the first target signal, a frequency pattern of the first target signal, and identities of the first set of passive radios, and
• wherein the plurality of first reference signals comprises a plurality of positioning reference signals;
• receiving, from the network device, at least one first reference signal;
• upon receiving the at least one first reference signal, receiving, based on the first configuration information, the plurality of first target signals from the first set of passive radios,
• wherein receiving the plurality of first target signals comprises:
• upon receiving the at least one first reference signal, determining the plurality of first target signals to be received from the first set of passive radios based on the first mapping;
• and
• receiving the plurality of first target signals during the first time window;
• transmitting, to the second location management device, measurements related to the at least one first reference signal and the plurality of first target signals for positioning the terminal device,
• wherein the measurements related to the at least one first reference signal and the plurality of first target signals comprise:
• receiving and transmitting time differences and signal strengths of a first number of the first reference signals, and receiving and transmitting time differences and signal strengths for the plurality of first target signals, and
• differential receiving and transmitting time differences and differential signal strengths between the plurality of first target signals and the first number of the first reference signals;
• receiving, from the location management device, a first measurement indication of the at least one first reference signal;
• measuring, based on the first measurement indication, at least one receiving and transmitting time difference and at least one signal strength for the at least one first reference signal;
• receiving, from the location management device, a second measurement indication of the plurality of first target signals;
• measuring, based on the second measurement indication, receiving and transmitting time differences and signal strengths for the plurality of first target signals, and differential receiving and transmitting time differences and differential signal strengths associated with the plurality of first target signals,
• wherein the differential receiving and transmitting time differences associated with the plurality of first target signals comprise differential receiving and transmitting time differences between time differences of the at least one first reference signal and time differences of the plurality of first target signals, and
• wherein the differential signal strengths associated with the plurality of first target signals comprise differences between at least one signal strength of the at least one first reference signal and signal strengths of the plurality of first target signals;
• and
• transmitting, to a second set of passive radios, a plurality of second reference signals, the second set of passive radios being caused to transmit a plurality of second target signals to the network device in response to receiving the plurality of second reference signals,
• wherein the plurality of second reference signals comprises a plurality of sounding reference signals.