公开(公告)号：US06810270B1

公开(公告)日：2004-10-26

申请号：US09705093

申请日：2000-11-02

申请人： Ossi Ilari Grohn ,  Anthony Salvatore Fugaro ,  Michael Francis Marlborough

发明人： Ossi Ilari Grohn ,  Anthony Salvatore Fugaro ,  Michael Francis Marlborough

IPC分类号： H04B138

CPC分类号： H04J3/0647

摘要： A method and apparatus for supplying a timing signal from a central unit to at least one radio head connected to the central unit via a communications link. An external signal, typically generated by a MSC, is received at a first framer of the central unit and the first framer generates a reference clock signal based thereon. This reference clock signal is used as the transmit clock for a second framer, known as the radio head framer. The radio head framer transmits a radio head downlink signal to the radio head(s) via the communications link. The radio head downlink signal typically includes payload information and an associated timing reference signal, typically in the form of an embedded clock signal. This timing reference signal of the downlink is based on the reference clock signal from the first framer, rather than being based on a clock signal from an oscillator within the central unit. The transceivers within the radio head(s) may then control their RF transmissions using the timing reference signal from the radio head framer of the central unit. Accordingly, the radio head(s) are provided with a timing reference signal that is based relatively directly on the signal from the MSC.

摘要翻译： 一种用于经由通信链路将定时信号从中央单元提供给连接到中央单元的至少一个无线电头的方法和装置。 通常由MSC产生的外部信号在中央单元的第一成帧器处被接收，并且第一成帧器基于此产生参考时钟信号。 该参考时钟信号被用作第二成帧器的发射时钟，称为无线电头部成帧器。 无线电头成帧器经由通信链路将无线电头下行链路信号发送到无线电头。 无线电头下行信号通常包括有效载荷信息和相关联的定时参考信号，通常以嵌入式时钟信号的形式。 下行链路的该定时参考信号基于来自第一成帧器的参考时钟信号，而不是基于来自中央单元内的振荡器的时钟信号。 无线电头内的收发器然后可以使用来自中央单元的无线电头部成帧器的定时参考信号来控制其RF传输。 因此，无线电头具有相对直接基于来自MSC的信号的定时参考信号。