Handling of radio frequency front-end group delays for round trip time estimation
摘要
說明書
At 950, the network entity may transmit the one or more RTTM signals to the UE on the RTTM resources. Each RTTM signal may comprise an RTTM waveform, which enables the UE to detect/measure the RTTM signal. For each RTTM signal, the network entity may measure the transmission of the RTTM waveform at the measured RTTM transmit time t1 in the digital domain. For example, the measured RTTM transmit time t1 may correspond to the frame, subframe, or a slot of the RTTM resource scheduled/allocated for the symbols of the RTTM signal. The measured RTTM transmit time t1 may represent a time just prior to the symbols of the RTTM signal being converted to RTTM waveform for transmission. Each RTTM transmit time may be independent of RTTM transmit times of other RTTM signals.
In an aspect, the network entity may adjust the bandwidth of the transmitted RTTM waveforms based on the UE capabilities. In general, wider bandwidth enables the UE to more accurately measure the arrival times of the RTTM waveforms. However, such accuracy would be wasted if the UE's group delay measurement uncertainty overwhelms the high accuracy timing estimate. By provisioning the bandwidth accordingly, such waste can be prevented.
