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

A radio frequency remote module and clock technology, which is applied in the field of communication, can solve the problems of increasing clock accuracy, failure to meet cascading requirements, and long adjustment cycle, etc., to improve flexibility, increase cascading stages, and improve clock indicators Effect

CN101437320AInactive Publication Date: 2009-05-20ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2009-05-20
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0031] The core idea of ​​the present invention is: adopt soft PLL and hard PLL in the implementation process, and use them according to their respective characteristics. For cascading, it is necessary to ensure that the deterioration of the clock accuracy is as small as possible. Therefore, for the optical interface Part of the tightly coupled hard PLL method uses the clock recovered from the optical port as the reference source to directly generate the optical port cascaded clock; for the local intermediate frequency radio frequency part, the phase noise of the clock is very important to the performance of the system, so loosely coupled The soft phase-locked loop method produces a local reference clock source with low phase noise.

[0032] Such as figure 2 As shown, the multi-stage cascaded clock processing device of the radio remote module includes sequentially connected optical interface clock recovery, hard phase-locked loop, optical interface transmission clock, and a s...