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就C3G-A同步的关键点:非直通终端与网关同步,提出了一种既不需借助GPS,也不会增加系统复杂度的同步算法。该算法分为初始同步、闭环同步、同步保持3个过程。非直通终端在转发帧GTS1时隙接收网关广播公告消息,完成初始同步;网关在检测窗搜索非直通终端发送的上行同步码,确定定时提前量,建立闭环同步;网关在转发帧同一时隙测量非直通终端的训练序列,确定同步偏移,实现同步保持。
The key point for C3G-A synchronization: The non-direct terminal is synchronized with the gateway, and a synchronization algorithm that does not require GPS or increase system complexity is proposed. The algorithm is divided into initial synchronization, closed-loop synchronization, synchronization to maintain the three processes. The non-through terminal receives the broadcast announcement message of the gateway in the time slot of the forwarding frame GTS1 to complete the initial synchronization. The gateway searches the detection window for the uplink synchronization code sent by the indirect terminal to determine the timing advance and establish closed-loop synchronization. The gateway measures the same time slot in the forwarding frame Non-through terminal training sequence to determine the synchronization offset, to achieve synchronization.