WO2016095526A1

WO2016095526A1 - Time service method, apparatus and system, and storage medium

Info

Publication number: WO2016095526A1
Application number: PCT/CN2015/085080
Authority: WO
Inventors: 唐雄; 吴安平
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-16
Filing date: 2015-07-24
Publication date: 2016-06-23
Also published as: CN105764132A

Abstract

Provided are a time service method, apparatus and system. The method comprises: receiving a clock signal sent by a standard clock source (S101); parsing the clock signal to acquire time information (S102); and sending the time information via a low-frequency wireless signal (S103). By the implementation of the present invention, a clock signal sent by a standard clock source such as a GPS satellite is parsed to obtain time information, and then the time information is sent out using a low-frequency wireless signal, such that time service for a small-sized base station is achieved. In addition, due to the characteristic that the low-frequency wireless signal can penetrate through indoor wall shielding and attenuate, large-scale time service for the small-sized base station including an indoor base station can be achieved.

Description

Timing method, device and system, storage medium

Technical field

The present invention relates to the field of clock synchronization, and in particular, to a timing method, device and system, and storage medium.

Background technique

Wireless base stations are increasingly miniaturized, and many miniaturized wireless base stations do not have the clock synchronization condition for acquiring satellites as reference sources. In order to enable such a base station to obtain a reference clock, the prior art provides a network clock synchronization technology and an air interface synchronization technology to solve this problem, but such technologies have high requirements on the network environment, such as air interface synchronization technology, when the network environment is bad. Interlocking between wireless base stations is prone to occur, resulting in problems such as increased clock error.

Therefore, how to provide a timing technology capable of timing a miniaturized base station such as a wireless base station is a technical problem to be solved by those skilled in the art.

Summary of the invention

In order to solve the existing technical problems, the present invention provides a timing method, device and system, and storage medium.

The present invention provides a timing method, in one embodiment, comprising: receiving a clock signal transmitted by a standard clock source; parsing the clock signal to acquire time information; and transmitting time information by the low frequency wireless signal.

As an implementation manner, the step of acquiring the time information by the parsing clock signal in the foregoing embodiment includes: acquiring, tracking, demodulating, synchronizing, and calculating the clock signal to obtain time information.

As an implementation manner, before sending the time information, the foregoing embodiment further includes: The timing range calculates the transmit power and transmits the power transmission time information.

As an implementation manner, the time information in the foregoing embodiment includes a 1PPS signal and a TOD signal, and the step of transmitting time information by using the low frequency wireless signal includes: grouping the 1PPS signal and the TOD signal into a packet by using a low frequency wireless signal. data pack.

As an implementation manner, the step of transmitting a data packet by using a low frequency wireless signal in the foregoing embodiment includes: using a 1PPS signal as a basic frame, performing frame header alignment and sampling, and transmitting a basic frame according to a frequency of the 1PPS signal; and encapsulating the TOD signal as A data frame that transmits a data frame in the middle of a transmission period of a basic frame.

The present invention provides a timing device. In one embodiment, the method includes: a receiving module configured to receive a clock signal sent by a standard clock source; a parsing module configured to parse the clock signal to obtain time information; and a sending module configured to pass Low frequency wireless signal transmission time information.

As an implementation manner, the parsing module in the foregoing embodiment is further configured to obtain time information after performing signal capture, tracking, demodulation, synchronization, and calculation on the clock signal.

As an implementation manner, the foregoing embodiment further includes a calculation module configured to calculate transmit power according to a time range, and the sending module is further configured to send time information by using transmit power.

As an implementation manner, the time information in the foregoing embodiment includes a 1PPS signal and a TOD signal, and the sending module is further configured to form the data packet by using the 1PPS signal and the TOD signal in a message manner, and send the data packet by using the low frequency wireless signal.

As an implementation manner, the sending module in the foregoing embodiment is further configured to use the 1PPS signal as a basic frame, perform frame header alignment and sampling, and send a basic frame according to a frequency of the 1PPS signal; and encapsulate the TOD signal into a data frame in the basic frame. The data frame is sent in the middle of the transmission cycle.

The present invention provides a communication system including the timing device provided by the present invention.

The present invention provides a storage medium having stored therein a computer program configured to perform the timing method.

The beneficial effects of the invention:

The solution provided by the invention obtains time information by parsing a clock signal sent by a standard clock source, such as a GPS positioning satellite, and then transmits the time information by using a low-frequency wireless signal, thereby realizing the timing of the miniaturized base station and at the same time due to the low frequency. The wireless signal can penetrate the shielding and attenuation characteristics of the indoor wall, and can realize a wide range of timing for the miniaturized base station including the indoor base station.

DRAWINGS

1 is a flowchart of a timing method according to a first embodiment of the present invention;

2 is a schematic diagram of a timing device according to a second embodiment of the present invention;

FIG. 3 is a flowchart of a timing method according to a third embodiment of the present invention.

detailed description

The present invention will now be described as an implementation by way of specific embodiments in conjunction with the accompanying drawings.

First embodiment:

FIG. 1 is a flowchart of a timing method according to a first embodiment of the present invention. As shown in FIG. 1, in the embodiment, the timing method provided by the present invention includes the following steps:

S101: Receive a clock signal sent by a standard clock source.

The standard clock source can be a commonly used GPS timing system, or a timing system such as Beidou or Galileo. The clock signal format of different timing systems may be different, but the clock signal can be completed by using a corresponding receiving antenna (such as a GPS antenna). Receiving

S102: Parsing clock signal acquisition time information;

The time information mainly refers to the current time, frame number and other information;

S103: Send time information by using a low frequency wireless signal.

In some embodiments, the step of acquiring the time information by the parsing clock signal in the embodiment shown in FIG. 1 includes: after the clock signal is captured, tracked, demodulated, synchronized, and calculated, Time information.

In some embodiments, before the sending the time information, the embodiment shown in FIG. 1 further includes: calculating the transmit power according to the time limit range, and transmitting the power transmission time information.

In some embodiments, the time information in the embodiment shown in FIG. 1 includes a 1PPS signal and a TOD signal, and the step of transmitting the time information by using the low frequency wireless signal includes: grouping the 1PPS signal and the TOD signal into a packet by using a low frequency. Wireless signal transmission packet.

In some embodiments, the step of transmitting a data packet by the low frequency wireless signal in the embodiment shown in FIG. 1 includes: using a 1PPS signal as a basic frame, performing frame header alignment and sampling, and transmitting a basic frame according to a frequency of the 1PPS signal; The signal is encapsulated into a data frame, and the data frame is transmitted in the middle of the transmission period of the basic frame.

Second embodiment:

2 is a schematic diagram of a timing device according to a second embodiment of the present invention. As shown in FIG. 2, in the embodiment, the timing device 2 includes a receiving module 21, a parsing module 22, and a sending module 23, where

The receiving module 21 may be a commonly used GPS antenna or the like, and configured to receive a clock signal sent by a standard clock source;

The parsing module 22 is configured to parse the clock signal acquisition time information;

The sending module 23 is configured to send time information by using a low frequency wireless signal.

In some embodiments, the parsing module 22 in the embodiment shown in FIG. 2 is further configured to perform time information on signal capture, tracking, demodulation, synchronization, and calculation of the clock signal; and may use a commonly used uBlox GPS receiver, etc. .

In some embodiments, as shown in FIG. 2, the timing device 2 provided by the present invention further includes a calculation module 24 configured to calculate the transmission work according to the timing range, and the transmitting module 23 is further configured to transmit the time information at the transmission power.

In some embodiments, the time information in the above embodiment includes a 1PPS signal and a TOD letter. In this case, the transmitting module 23 in the embodiment shown in FIG. 2 is further configured to form a data packet by using a 1PPS signal and a TOD signal in a message manner, and send the data packet through the low frequency wireless signal.

In some embodiments, the sending module 23 in the foregoing embodiment is further configured to use the 1PPS signal as a basic frame, perform frame header alignment and sampling, and send a basic frame according to the frequency of the 1PPS signal; and encapsulate the TOD signal into a data frame, in the basic The data frame is sent in the middle of the transmission period of the frame.

Third embodiment:

The present invention is described as an implementation manner by using a specific application example. In this embodiment, a standard clock source is used as a GPS system as an example for description.

As can be seen from FIG. 3, in the embodiment, the timing method provided by the present invention includes the following steps:

S301: Select a standard clock source;

This embodiment takes the GPS timing commonly used in the industry as an example. The functions of Beidou/Glonass/Galileo are similar, and will not be described again. According to the demand, different satellite receiving and even multiple satellite receiving can be selected to meet the future wireless base station satellite timing. development of;

S302: Receive an original clock signal by using a GPS antenna.

The original clock signal refers to the signal directly received by the GPS antenna, and there may be interference. In actual use, the following main indicators can be met: frequency: 1575.42±5MHz, gain: 38±2dB, dielectric antenna gain: 4dBi, noise figure : ≤ 2.7dB, output standing wave ratio: 2.5max;

S303: Perform filtering and noise reduction processing on the original clock signal to obtain a clock signal, and send the signal to the GPS receiver through the GPS RF feed line;

The GPS antenna receives the GPS signal and performs processing filtering and noise reduction. The existing processing method is not described in this application; the carrier signal received by the GPS antenna is 1575.42 MHz (L1 band) and 1227.6 MHz (L2 band) through the RF feeder. Transfer to the GPS receiver;

The GPS RF feeder refers to the coaxial RF cable used for the transmission of the RF signal from the GPS antenna to the GPS receiver. The length is longer. When the 1/4" and 1/2" main feeders are used, the two ends of the main feeder are not required. Jumper connection is used; but when using the 7/8" main feeder, it is necessary to connect the GPS antenna and the lightning arrester on the equipment side with the 1/2" cable as the jumper at both ends of the main feeder. Between the GPS receivers, connect with a semi-soft fine jumper;

S304: The GPS receiver extracts the 1PPS signal and the TOD signal;

The GPS receiver can use the uBlox GPS receiver, which uses ANTARIS SuperSense weak signal tracking technology. The tracking sensitivity exceeds -158dBm with enhanced capture sensitivity, providing high positioning accuracy and dynamic navigation performance at low signal levels.

S305: The 1PPS signal and the TOD signal are formed into a packet Packet in a message manner;

In practical application, 1PPS is used as a basic frame, the frame header is aligned with the 1PPS signal, the 1PPS is sampled, and the basic frame is transmitted according to the frequency of the PP1S; the TOD signal is encapsulated into a data frame, in the middle of the basic frame period. For the transmission of the message, the ARM A9 processor can be used to complete the digital processing of this part, mainly performing computational control, completing the framing and de-frameping of the message, message response and exception handling;

S306: Calculate the transmit power, and send the packet Packet through the digital intermediate frequency part through the low frequency wireless signal;

The Packet is placed in the digital intermediate frequency portion of the wireless signal, modulated, and controls the uplink signal in the digital domain, and can independently control and correct the uplink noise of each stage; the transmitting part amplifies and filters the intermediate frequency signal, and Controlling the transmit power, the power of the power amplifier of the device is related to the coverage, and the bandwidth requirement is not high;

The low frequency involved in this application refers to the low frequency band in the radio spectrum. In the subsequent spectrum planning, such as the frequency of 700Mhz and below is likely to be used for wireless communication, and the low spectrum occupies the coverage advantage.

In summary, through the implementation of the present invention, at least the following beneficial effects exist:

By analyzing the clock signal sent by a standard clock source, such as a GPS positioning satellite, the time information is obtained, and the time information is transmitted by using the low-frequency wireless signal, thereby realizing the miniaturization basis. The timing of the station, as well as the low-frequency wireless signal can penetrate the shielding and attenuation characteristics of the indoor wall, can realize a wide range of timing for small-scale base stations including indoor base stations.

The embodiment of the invention further describes a storage medium in which a computer program is stored, the computer program being configured to perform the timing method of the foregoing embodiments. .

The above is only a specific embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, equivalent change, combination or modification of the above embodiments in accordance with the technical spirit of the present invention is still in the present invention. The scope of protection of the technical solution of the invention.

Claims

A timing method comprising:

Receiving a clock signal sent by a standard clock source;

Parsing the clock signal acquisition time information;

The time information is transmitted by a low frequency wireless signal.
The timing method according to claim 1, wherein said step of parsing said clock signal acquisition time information comprises: after said signal capture, tracking, demodulation, synchronization and calculation of said clock signal, said time information is obtained .
The timing method according to claim 1, wherein before transmitting the time information, the method further comprises: calculating a transmission power according to a timing range, and transmitting the time information at the transmission power.
The timing method according to any one of claims 1 to 3, wherein the time information comprises a 1PPS signal and a TOD signal, and the transmitting the time information by the low frequency wireless signal comprises: the 1PPS signal and the TOD The signals form a data packet in a message manner, and the data packet is transmitted through a low frequency wireless signal.
The timing method according to claim 4, wherein said transmitting said data packet by said low frequency wireless signal comprises: aligning and sampling said 1PPS signal as a basic frame, according to a frequency of said 1PPS signal Transmitting the basic frame; encapsulating the TOD signal as a data frame, and transmitting the data frame in a middle of a transmission period of the basic frame.
A timing device comprising:

a receiving module configured to receive a clock signal sent by a standard clock source;

An analysis module configured to parse the clock signal to acquire time information;

And a sending module configured to send the time information by using a low frequency wireless signal.
The timing device of claim 6, wherein the parsing module is further configured to obtain the time information after performing signal acquisition, tracking, demodulation, synchronization, and calculation on the clock signal.
The timing device of claim 6, further comprising a calculation module configured to calculate transmit power based on a timing range, the transmitting module further configured to transmit the time information at the transmit power.
The timing device according to any one of claims 6 to 8, wherein the time information comprises a 1PPS signal and a TOD signal, and the transmitting module is further configured to form the data packet by using the 1PPS signal and the TOD signal in a message manner. Transmitting the data packet by a low frequency wireless signal.
The timing device according to claim 9, wherein the transmitting module is further configured to: use the 1PPS signal as a basic frame, perform frame header alignment and sampling, and send the basic frame according to a frequency of the 1PPS signal; The TOD signal is encapsulated into a data frame, and the data frame is transmitted in the middle of a transmission period of the basic frame.
A communication system comprising the timing device of any one of claims 6 to 10.
A storage medium storing a computer program configured to perform the timing method according to any one of claims 1 to 5.