Coexistence between radar application and communications in a mobile communications system

A non-transitory computer readable storage medium comprising instructions that, when executed by at least one processor, causes the at least one processor to carry out a method of performing a radar sensing function in a mobile communication device that operates in a Time Division Duplex (TDD) wireless communication system having an air interface that comprises a plurality of uplink symbol times, a plurality of downlink symbol times, a plurality of TDD transmission direction transition periods, and a plurality of transition pairs of symbol times, wherein each of the transition pairs of symbol times comprises one of the uplink symbol times and one of the downlink symbol times, and each of the TDD transmission direction transition periods is associated with one of the plurality of transition pairs of symbol times and is immediately preceded by a first one of the uplink and downlink symbol times of the associated transition pair of symbol times and is immediately followed by a second one of the uplink and downlink symbol times of the associated transition pair of symbol times, wherein the method comprises:

• using information about a path delay between the mobile communication device and a receiver as one of one or more bases to determine a timing of a radar operation window at the mobile communication device comprising a radar signal transmission period and a radar backscatter reception period, wherein the determined timing of the radar operation window is configured to:
• cause the radar signal, when transmitted from the mobile communication device within the determined radar signal transmission period, to arrive at the receiver during a portion of a first TDD transmission direction transition period of the receiver;
• and
• cause a radar backscatter signal to arrive at the mobile communication device during the radar backscatter reception period;
• and
• transmitting the radar signal within the determined radar signal transmission period.

An apparatus configured for performing a radar sensing function in a mobile communication device that operates in a Time Division Duplex (TDD) wireless communication system having an air interface that comprises a plurality of uplink symbol times, a plurality of downlink symbol times, a plurality of TDD transmission direction transition periods, and a plurality of transition pairs of symbol times, wherein each of the transition pairs of symbol times comprises one of the uplink symbol times and one of the downlink symbol times, and each of the TDD transmission direction transition periods is associated with one of the plurality of transition pairs of symbol times and is immediately preceded by a first one of the uplink and downlink symbol times of the associated transition pair of symbol times and is immediately followed by a second one of the uplink and downlink symbol times of the associated transition pair of symbol times, the apparatus configured to:

• use information about a path delay between the mobile communication device and a receiver as one of one or more bases to determine a timing of a radar operation window at the mobile communication device comprising a radar signal transmission period and a radar backscatter reception period, wherein the determined timing of the radar operation window is configured to:
• cause the radar signal, when transmitted from the mobile communication device within the determined radar signal transmission period, to arrive at the receiver during a portion of a first TDD transmission direction transition period of the receiver;
• and
• cause a radar backscatter signal to arrive at the mobile communication device during the radar backscatter reception period;
• and
• transmit the radar signal within the determined radar signal transmission period.