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A high-precision clock synchronization method for rru based on Kalman sliding window filtering

A high-precision clock and sliding window technology, which is applied in the field of communication, can solve the problems of time accuracy influence, phase measurement deviation, and difficulty in achieving high-precision time synchronization in transmission, and achieve high-precision calibration and improve convergence accuracy.

Active Publication Date: 2022-08-05
NANJING DIGITGATE COMM TECH CO LTD
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  • Description
  • Claims
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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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  • A high-precision clock synchronization method for rru based on Kalman sliding window filtering
  • A high-precision clock synchronization method for rru based on Kalman sliding window filtering
  • A high-precision clock synchronization method for rru based on Kalman sliding window filtering

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Embodiment Construction

[0034] 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.

[0035] 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:

[0036] 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.

[0037] Step 2. The slave clock sends a Delay Req message an...

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Abstract

The invention discloses an RRU high-precision clock synchronization method based on Kalman sliding window filtering. The time stamp in a PTP message is used as an observation value, and clock deviation, frequency deviation and frequency change rate are calculated, and the calculated value is used to compare The clock is compensated, and the clock model is revised to improve the clock synchronization accuracy between the master and slave nodes. The purpose is to improve the time stamp count deviation caused by the clock frequency drift determined by the hardware characteristics of the RRU clock crystal oscillator, resulting in the instantaneous jitter phenomenon of high-precision time synchronization, which can effectively improve the convergence accuracy of PTP time synchronization and ensure the reliability of RRU service operation. Continuous stability and peak throughput reduce operators' base station maintenance costs.

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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Patent Type & Authority Patents(China)
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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