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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

Active Publication Date: 2022-06-03
NANJING DIGITGATE COMM TECH CO LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Path asymmetry can be alleviated manually, but it is generally difficult to completely eliminate it
Since the time information is transmitted by adding a time stamp in the message, it is required that the two-way delay of the intermediate link must be consistent, and the inconsistency of the delay will cause phase measurement deviation, which will have a certain impact on the time accuracy
In addition, the time accuracy will also be affected by factors such as packet loss
Moreover, using software to realize the setting of the IEEE 1588 protocol stack will also cause the jitter of the protocol stack processing delay due to the multitasking of the software processing flow and the operating system. Therefore, if the IEEE 1588v2 protocol is implemented by software, it will be difficult to achieve the expected transmission. Requirements for High-Precision Time Synchronization

Method used

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

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Embodiment Construction

[0023] In order to better embody the present invention, the present invention will be further explained below with reference to the accompanying drawings and specific embodiments of the description.

[0024] like figure 1 As shown, this embodiment discloses a high-precision clock synchronization method for RRU based on Kalman sliding window filtering, which specifically includes:

Step 1. In the working mode of two_step, the master clock sends a Sync message periodically, and records the precise sending time t1 of the Sync message. The master clock encapsulates the precise sending time t1 into a Follow_up message and sends it to the slave clock; the slave clock records The Sync message arrives at the slave clock with an accuracy of t2. When t2 arrives, the PTP event message (sync / delay_req) sends the timestamp register (80bits) + sequenceId register. When the register is updated, an interrupt is triggered.

[0025] Step 2. The slave clock sends a Delay Req message and record...

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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.

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

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Application Information

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IPC IPC(8): H04J3/06
CPCH04J3/0667Y02D30/70
Inventor 华得成何玉军武波黄艮燕
Owner NANJING DIGITGATE COMM TECH CO LTD
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