User equipment coordinated radar sensing

1 . A method, by a first user equipment (UE) of a plurality of UEs in a cellular network, comprising:

configuring, based on a configuration for coordinating the plurality of UEs to detect one or more objects, a second UE of the plurality of UEs to transmit, as a first radar signal, either a Sounding Reference Signal (SRS) or a Random Access Channel (RACH) signal utilized by the second UE for cellular signaling;

sending, to a third UE of the plurality of UEs, a radar detection configuration message identifying one or more attributes associated with the first radar signal;

receiving, from the third UE, first radar signal samples based on the third UE receiving the first radar signal in a plurality of reflection states;

filtering the first radar signal samples to remove samples associated with the third UE receiving the first radar signal directly from the second UE; and

responsive to filtering the first radar signal samples, determining object location information based on at least the filtered first radar signal samples.

2 . The method of claim 1 , wherein

a first reflection state of the plurality of reflection states is a direct reception state where the third UE receives the first radar signal directly from the second UE, and wherein a second reflection state of the plurality of reflection states is a reflected state where the third UE receives the first radar signal reflected by one or more objects.

3 . The method according to claim 1 , further comprising at least one of:

receiving a first portion of the configuration from a base station; or

generating a second portion of the configuration locally at the first UE.

4 . The method according to claim 1 , further comprising:

determining the configuration based on:

receiving an air interface resource allocation from a base station;

selecting a subset of air interface resources from the air interface resource allocation for transmission and reception of the first radar signal; and

determining a waveform for the first radar signal.

5 . The method according to claim 1 , wherein configuring the second UE to transmit the first radar signal further comprises sending a message to the second UE identifying a waveform to be utilized as the first radar signal and further identifying transmission parameters for transmitting the first radar signal.

6 . The method according to claim 1 , wherein the radar detection configuration message identifies a beamforming configuration to be utilized by the third UE.

7 . The method according to claim 1 , further comprising:

receiving, from the second UE, second radar signal samples associated with the first radar signal transmitted by the second UE,

wherein filtering the first radar signal samples comprises canceling the second radar signal samples from the first radar signal samples.

8 . The method according to claim 7 , further comprising:

configuring a fourth UE of the plurality of UEs to detect the first radar signal;

receiving, from the fourth UE, third radar signal samples based on the fourth UE receiving the first radar signal; and

refining the object location information based on the second radar signal samples.

9 . The method according to claim 7 , further comprising:

configuring a fourth UE of the plurality of UEs to transmit a second radar signal;

receiving, from the third UE, fourth radar signal samples based on the third UE receiving the second radar signal in a plurality of reflection states; and

refining the object location information based on the second radar signal samples.

10 . The method according to claim 1 , further comprising:

configuring the second UE to detect a second radar signal;

configuring the third UE to transmit the second radar signal;

receiving, from the second UE, third radar signal samples based on the second UE receiving the second radar signal; and

refining the object location information based on the third radar signal samples.

11 . The method according to claim 1 , wherein one of: the first UE and the third UE are a same user equipment; or the third UE is a different user equipment from the first UE and the second UE.

12 . A first UE including a wireless interface and a processor coupled to the wireless interface and configured to implement a method according to claim 1 .

13 . The method of claim 1 , wherein the one or more attributes include at least one of: a waveform attribute of the first radar signal or a timing attribute associated with a transmission of the first radar signal.