An open-loop uplink synchronization method, device, apparatus and storage medium

Abstract

The embodiment of the application discloses a kind of open loop uplink synchronization methods, device, equipment and storage medium.Method comprising: calculating uplink frame number based on UTC time and preset uniform mapping rule, the starting time of uplink frame is calculated based on the uplink frame number;Receive downlink broadcast message and obtain feeder link public time delay and ephemeris data from it, then calculate the distance between user terminal and satellite based on ephemeris data to calculate service link time delay;Feeder link public time delay and service link time delay are both one-way time delay, obtain fine adjustment value from MAC CE command, calculate uplink advance in combination with feeder link public time delay and service link time delay;Determine uplink time according to starting time and uplink advance, and send uplink frame at the uplink time.The application can be based on not depending on downlink signal detection synchronization, by the mapping of global time and the estimation and compensation of one-way propagation time delay, independently realize the synchronization of uplink signal, achieve the decoupling of heterogeneous wireless technology uplink networking.

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