Method and apparatus for processing clock suitable for multilevel cascade of radio frequency zooming module

Abstract

The invention discloses a clock processing method suitable for multistage cascaded radio remote unit, which comprises: (a) an optical interface clock recovers a clock signal CLK0 acquired in data received from a baseband module or an upper-stage radio remote unit according to the radio remote unit; and (b) a hard phase-locked loop PLL1 takes the acquired clock signal CLK0 as a reference clock and outputs a clock signal CLK1 as a clock signal of an optical interface transmission clock of the radio remote unit, and the optical interface transmission clock transmits the received clock signal to the next radio remote unit; and a soft phase-locked loop PLL2 inputs the acquired clock signal CLK0 as a reference clock and outputs a clock signal CLK2 as a local reference clock according to a soft phase-locked algorithm. The method and the device can acquire optimization of indexes of clock accuracy and phase noise.

Description

technical field [0001] The present invention relates to base station equipment in the field of communications, and in particular to a clock processing method and device for a radio remote unit (RRU, Radio Remote Unit) under the condition of multi-stage cascading of a baseband module and a remote radio module. Background technique [0002] In the mobile communication system, the base station equipment gradually adopts the design framework of baseband and mid-radio frequency separation to meet the powerful baseband processing capability and flexible networking and coverage requirements. The functions of the baseband processing part constitute the baseband module, usually called BBU (Base Band Unit), and the radio frequency processing part constitutes the remote radio module, usually called RRU (Radio Remote Unit). BBU and RRU usually use optical interface to communicate. The optical interface part includes optical transceiver module and SERDES (Serializer & Deserializer, seria...

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Problems solved by technology

[0011] The above-mentioned processing method can meet the performance requirements under the single-stage condition, but under the multi-stage cascade condition, the existing problem is that the soft phase-locked loop adopts a loose coupling method, and because the adjustment period is long, as the cascade stage As the number increases, the clock accuracy will show a non-linear deterioration and increase trend, which cannot meet the cascading requirements of more levels.

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