Handling of radio frequency front-end group delays for round trip time estimation
摘要
說明書
An RF chain may be a receiver chain or a transmitter chain, and is the hardware utilized to receive or transmit RF signals of a given frequency or set of frequencies. More specifically, a receiver chain includes the hardware components of a single hardware receiver of a plurality of hardware receivers of the device, and may include a receive antenna, radio, and modem. Likewise, a transmitter chain includes the hardware components of a single hardware transmitter of a plurality of hardware transmitters of the device, and may include a transmit antenna, radio, and modem. A device (e.g., a gNodeB 202-206 or UE 102) may have multiple receiver/transmitter chains, and may thereby be able to transmit and/or receive RF signals on multiple frequencies at the same time.
In an aspect, in (massive) MIMO systems, either or both of the gNodeBs 202-206 and the UE 102 may repeat their RTTMs/RTTRs multiple times. The different repetitions may use either the same or different transmission beams. When a signal is repeated with the same transmission beam, it is intended to support reception-beam-sweeping (in addition to coherent-combining if needed) at the receiving end-point (the UE 102 or a gNodeB 202-206).
In an aspect, the angle-of-arrival (AoA)/angle-of-departure (AoD) (at the gNodeB 202-206) associated with the beam-index information may be used in conjunction with RTT estimates to compute the geographic position of the UE (RTT plus AoA/AoD based positioning).
