Handling of radio frequency front-end group delays for round trip time estimation
摘要
說明書
At 1150, the UE may determine the payloads for the corresponding RTTR resources. In one aspect, the UE may explicitly include the actual UE response delay (e.g., actual UE turn-around time (t3′?t2′) and/or the actual UE Rx?Tx time difference (t2′?t3′)) in the RTTR payload. Note that the UE has available the UE total GD (determined at 1120). The UE also has available the measured RTTM arrival time t2. Further, UE is aware of the scheduled transmission time of the RTTR waveform in the digital domain. That is, the UE has available the measured RTTR transmit time t3, which may correspond to the frame, subframe, or a slot of the RTTR resource scheduled/allocated for the symbols of the RTTR signal. Therefore, in this one aspect, the UE may calculate the actual UE response delay. That is, the UE may calculate the actual UE turn-around time through equation (11). For example, the UE may calculate the actual UE turn-around time by adding the UE total GD to the measured UE turn-around time. Alternatively or in addition thereto, the UE may calculate the actual UE turn-around time through equation (11a). For example, the UE may calculate the actual UE Rx?Tx time difference by subtracting the UE total GD from the measured UE Rx?Tx time difference. In another aspect, the UE may explicitly include the measured UE response delay in the RTTR payload. In both aspects, the measured RTTR transmit time t3 may represent a time just prior to the symbols of the RTTR signal being converted to RTTR waveform for transmission.
