SAToIP的联合自适应时钟恢复机制及性能分析

设计一种应用于SAToIP模式下的联合自适应时钟恢复机制.利用接收端的时间戳进行频率估计,恢复出上行时钟的信息.为了在相同的时间间隔内获得更高的精确度,进行了分频比的统计校正.针对消抖缓存区出现溢出或者“读空”的现象,在缓存区设定门限,进行占满偏移率的补偿.综合利用基于时间戳以及基于消抖缓存区的技术,克服了IP网络的随机时延抖动.仿真结果表明,经过该机制的恢复后的时钟信息优于相关标准的要求.通过对试验样机平台的测试,证实了本机制达到较好的业务性能.

Joint adaptive clock recovery mechanism for SAToIP and performance analysis

A mechanism of joint adaptive clock recovery was designed for structure agnostic time division multiplex over IP (SAToIP) mode. Timestamps received were used to estimate frequency in order to recover timing information sent by uplink. The statistical correction of frequency-dividing ratio was utilized to achieve better accuracy in the same interval. Threshold was set for jitter buffer in order to avoid overflow/underflow, and offset compensation was taken. The mechanism benefited from the technique based on timestamp and jitter buffer, overcoming IP network’s random delay variation. Simulation results show that timing information recovered by the mechanism is better than certain related standards’ requirements. Data from sample platform show that the mechanism has good service performance.