如何在iPhone之间准确同步时间？ [英] How to accurately sync time between iPhones?

问题描述

我正在编写一个应用程序，要求我准确地同步大量iPhone上的时间（在几分之一秒内）。据我所知，无法访问GPS的时间功能。如果我通过Internet同步，那么最大的问题是网络延迟。收到回复请求之前的延迟估计可以是往返的一半 - 但我可以预期这个有多准确？是否值得发送多个请求和平均值，还是有另一种更好的同步时间方法？

I am writing an application that will require me to sync the time on a large number of iPhones accurately (to within a fraction of a second). As far as I can tell, access to the time function of the GPS is not available. If I sync over the Internet, then the biggest problem is network latency. The delay before the answer to a request is received can be estimated to be half the round trip - but how accurate can I expect this to be? Would it be worthwhile sending multiple requests and averaging or is there another better way of synchronising time?

推荐答案

尝试实现 Marzullo的算法，特别用于 NTP 。

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