Handling of radio frequency front-end group delays for round trip time estimation
摘要
說明書
Equation (11) or (11a) can be rearranged as: (t3?t2)=(t3′?t2′)?UE total GD ??(12) or (t2?t3)=(t2′?t3′)+UE total GD ??(12a).
Then equation (10), (10a) may be rewritten as: actual RTT=(t4?t1)?(t3′?t2′)?network total GD ??(13) or actual RTT=(t4?t1)+(t2′?t3′)?network total GD ??(13a).
Equations (13), (13a) indicate that as long as the UE (or generically the receiver 504) reports back the actual turn-around time (t3′?t2′) and/or the UE Rx?Tx time difference (t2′?t3′) in the RTTR payload, the network node (or generically the transmitter 502) may accurately calculate the RTT without having to be apprised of the specific value of the UE total GD. This means that each of the network node and the UE need to be only aware of its own total GD. Thus, in one aspect, the UE may explicitly include the actual UE turn-around time and/or the actual UE Rx?Tx time difference in the RTTR payload.
