RRU high-precision clock synchronization method based on Kalman sliding window filtering

A high-precision clock and sliding window technology, applied in the field of communication, can solve the problems of time accuracy impact, jitter, phase measurement deviation, etc., and achieve the effect of improving convergence accuracy and high-precision calibration
CN114584248AActive Publication Date: 2022-06-03NANJING DIGITGATE COMM TECH CO LTD
4 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING DIGITGATE COMM TECH CO LTD
Publication Date
2022-06-03

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses an RRU high-precision clock synchronization method based on Kalman sliding window filtering, and the method comprises the steps: taking a timestamp in a PTP message as an observation value, carrying out the calculation of a clock deviation, a frequency deviation and a frequency change rate, carrying out the compensation of a clock through a calculation value, correcting a clock model, and improving the clock synchronization precision between a master node and a slave node. The invention aims to improve the instantaneous jitter phenomenon of high-precision time synchronization caused by timestamp counting deviation due to clock frequency drift determined by hardware characteristics of an RRU clock crystal oscillator, effectively improve the convergence precision of PTP time synchronization, ensure sustainable stability and peak throughput of RRU service operation, and reduce the base station maintenance cost of an operator.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the field of communications, in particular to an RRU high-precision clock synchronization method based on Kalman sliding window filtering. Background technique

[0002] The full name of IEEE 1588 is a precision clock synchronization protocol for networked measurement and control systems, commonly referred to as the Precision Time Protocol (PTP). The general purpose of using the IEEE 1588 precision time protocol is to maintain precise time synchronization and frequency synchronization between different nodes in Ethernet. There are also numerous applications in factory automation, measurement and communications that require very precise time synchronization, often beyond what a standard software-based solution can provide.

[0003] An indoor baseband processing unit (Building Baseband Unit, BBU) is used as a master clock, and a remote radio unit (Remote Radio Unit, RRU) is used as a slave clock. The BBU relies on GPS to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More