Handling of radio frequency front-end group delays for round trip time estimation
摘要
說明書
At 1240, the UE may transmit a test signal from the transmit antenna at transmit time tt. The transmit time tt is in the digital domain and may correspond to a frame, subframe, or a slot of the self-transmit resource in which symbols of the test signal are scheduled for transmission. The test signal may be a simulated RTTM signal. At 1250, the UE may listen on the received antenna and detect the reception of the test signal at receive time tr. The receive time tr is in the digital domain and may correspond to a frame, subframe, or a slot of the self-receive resource in which received symbols contained therein are recognized as the symbols of the test signal.
Since free antennas are needed for Rx during Tx transmission, the UE may request scheduling of resources for calibration gap with rank reduction at 1210. Alternatively or in addition thereto, the network entity may schedule the resources for calibration gap with rank reduction at 1220. Rank reduction indicates that the maximum rank of transmissions during the gap is reduced, which ensures that UE does not have to use all its transmit antennas during the calibration gap, thus allowing some antennas to be freed up for Rx.
