WO2016045314A1

WO2016045314A1 - Signal transmission method and system

Info

Publication number: WO2016045314A1
Application number: PCT/CN2015/073311
Authority: WO
Inventors: 邱文才; 戚晓霞; 罗文胜; 佘志兴
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-09-23
Filing date: 2015-02-26
Publication date: 2016-03-31
Also published as: CN105429690A

Abstract

Provided are a signal transmission method and system. The method comprises: modulating, by a sending-end device, a signal to be sent; and sending, by the sending-end device, the modulated signal to be sent to a receiving-end device through a radio-frequency coaxial cable, wherein the sending-end device is a remote global navigation satellite system (RGNSS) antenna, and the receiving-end device is a base station, and alternatively, the sending-end device is a base station, and the receiving-end device is an RGNSS antenna. By means of the present invention, the problems of high costs of an RGNSS, and complicated fabrication process and difficult maintenance of multiple strands of twisted-pair cables connecting a base station and a satellite existing in the prior art when the timing of the base station and the satellite adopts an RGNSS manner are solved, thereby guaranteeing the intensity of a transmitted satellite signal, and reducing the costs and maintenance difficulties of connecting wires between an RGNSS antenna and the base station.

Description

Signal transmission method and system

Technical field

The present invention relates to the field of communications, and in particular to a signal transmission method and system.

Background technique

For a wireless base station, a part of the standard (such as Code Division Multiple Access (CDMA)/Time Division-Synchronous Code Division Multiple Access (TD-) A radio base station of SCDMA)/Time Division Duplex (TDD)-Long-Term Evolution (LTE) requires absolute phase alignment of time bases between base stations. And part of the standard (such as Global System for Mobile Communication (GSM) / UMTS Terrestrial Radio Access Network (UTRAN) / Frequency Division Duplex (Frequency Division Duplex, FDD for short) The radio base station of the LTE) usually only needs the base station system clock frequency synchronization, and does not require alignment for the time phase. However, with the evolution of some new technologies, such as Dynamic Frequency and Channel Allocation (DFCA), Enhanced Inter-Cell Interference Coordination (eICIC), single frequency network A base station of the GSM/Universal Mobile Telecommunications System (UMTS)/FDD-LTE system, such as the Multimedia Broadcasting Multicast Service (MBMSFN), is using these new technologies. Time phase absolute alignment between base stations is also required. The usual practice is to use satellite timing to achieve clock time synchronization of the base station.

Base station satellite timing, there are two commonly used methods. As shown in Figure 1, the satellite receiver is built in the base station, and the satellite signal is received externally through the satellite receiving antenna installed on the sky surface, and the satellite signal is transmitted to the satellite receiver inside the base station through the RF coaxial cable. deal with. Method 2 is shown in Figure 2. The satellite receiving antenna and the satellite receiver are integrated in one device, installed on the surface of the sky, and the digital signal is transmitted to the base station through a multi-strand twisted pair cable. Usually we call this method remote. Global Global Navigation Satellite System (RGNSS).

The first method is the most widely used, but for some application scenarios (such as dense urban areas with large buildings, large stadiums, underground garages, subways, tunnels, etc.), because the distance between the sky and the base station is relatively long, there is RF coaxial. The problem that the length of the cable is too long and the satellite signal is weak, resulting in abnormal satellite search satellites, and satellite availability is reduced. The second method is a solution to the above application scenario, which can be well solved. The satellite signal is weak, but the cost of the multi-core waterproof connector on the RGSSS is relatively high. The multi-strand twisted-pair cable needs to be specially manufactured and cannot be processed on site. Especially for the construction of sites without prior engineering survey, these are very inconvenient. Factors limit the use of RGSSS.

In the prior art, when the RGSSS method is adopted, the cost of the RGSSS is high, and the manufacturing process of the multi-strand twisted pair cable connecting the base station and the satellite is complicated and difficult to maintain, and an effective solution has not been proposed.

Summary of the invention

The invention provides a signal transmission method and system, at least to solve the problem that the base station satellite timing in the prior art adopts the RGSSS mode, the cost of the RGSSS is high, and the multi-strand twisted pair cable connecting the base station and the satellite is complicated and difficult to manufacture. Maintenance issues.

According to an embodiment of the present invention, a signal transmission method is provided, including: a transmitting end device modulates a signal to be transmitted; and the transmitting end device sends the modulated signal to be transmitted to a receiving end through a radio frequency coaxial cable. The device, wherein the transmitting device is a remote global satellite navigation system RGSSS antenna, the receiving device is a base station; or the transmitting device is a base station, and the receiving device is an RGSSS antenna.

Preferably, when the transmitting end device is an RGSSS antenna, and the receiving end device is a base station, before the transmitting end device modulates the to-be-transmitted signal, the RGSNS antenna demodulates the received satellite signal. And obtaining the signal to be transmitted.

Preferably, the transmitting end device modulating the to-be-transmitted signal comprises: modulating a timing pulse signal and a time-and-date TOD message output by a global satellite navigation system GNSS receiver in the RGSSS antenna.

Preferably, the transmitting end device modulating the to-be-transmitted signal comprises: the RGSSS antenna modulating the to-be-transmitted signal to different frequencies.

Preferably, the transmitting end device is a base station, and when the receiving end device is an RGSSS antenna, the transmitting end device modulating the to-be-transmitted signal includes: a control signal that the base station sends to the RGSNS antenna Modulation is performed, wherein the control signal is used to query or set the state and parameters of the demodulation of the satellite signal.

Preferably, the transmitting end device is a base station, and when the receiving end device is an RGSSS antenna, the base station couples a power source to the radio frequency coaxial cable and sends the signal to the RGSNS antenna.

According to another embodiment of the present invention, a signal transmission system is further provided, comprising: a remote global satellite navigation system RGSSS antenna and a base station, wherein the RGSSS antenna is provided with a first modem unit, wherein the first a modem unit configured to modulate a signal to be transmitted sent to the base station; a second modem unit is disposed in the base station, wherein the second modem unit is configured to send to a Deriving a control signal of the RGSSS antenna and performing modulation, and demodulating the modulated signal to be transmitted received from the RGSSS antenna; the RGSSS antenna and the base station are connected by a radio frequency coaxial cable.

Preferably, the first modem unit is configured to demodulate the received satellite signal to obtain the signal to be transmitted.

Preferably, the first modem unit is further configured to modulate a timing pulse signal and a TOD time message output by the global satellite navigation system GNSS receiver in the RGSSS antenna.

Preferably, the first modem unit is further configured to modulate different signals to be transmitted to different frequencies.

Through the invention, the transmitting end device is used to modulate the signal to be transmitted; the transmitting end device transmits the modulated signal to be transmitted to the receiving end device through the radio frequency coaxial cable, wherein the transmitting end device is a remote global satellite navigation system RGSSS antenna, and receives The end device is a base station; or the transmitting device is a base station, and the receiving device is an RGSSS antenna. In the prior art, when the base station satellite timing is in the RGSSS mode, the cost of the RGSSS is high, and the multiple bases connected to the base station and the satellite are The problem that the twisted cable manufacturing process is complicated and difficult to maintain ensures the strength of the transmitted satellite signal and reduces the cost and maintenance difficulty of the connection line between the RGSSS antenna and the base station.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

Figure 1 is a schematic block diagram of the GNSS mode timing;

2 is a schematic block diagram of the RGSSS mode timing;

3 is a flow chart of a signal transmission method according to an embodiment of the present invention;

4 is a block diagram showing the structure of a signal transmission system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a satellite timing device according to an embodiment of the present invention; FIG.

6 is a schematic block diagram of an RGSSS satellite timing antenna according to an embodiment of the present invention;

FIG. 7 is a schematic block diagram of an internal unit of a base station according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the embodiment, a signal transmission method is provided. FIG. 3 is a flowchart of a signal transmission method according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:

Step S102, the transmitting end device performs modulation on the signal to be sent;

Step S104: The transmitting device sends the modulated signal to be sent to the receiving device through the radio frequency coaxial cable, where the transmitting device is a remote global satellite navigation system RGSSS antenna, and the receiving device is a base station; or, the transmitting device is The base station and the receiving end device are RGSNS antennas.

Through the above steps, the transmitting device modulates the signal to be transmitted and sends it to the receiving device through the RF coaxial cable, that is, the transmitting device modulates the signal to be transmitted into a signal completion signal suitable for transmission on the RF coaxial cable. Compared with the prior art base station satellite timing, when the RGSSS method is adopted, the cost of the RGSSS is high, and the multi-strand twisted pair cable connecting the base station and the satellite is complicated and difficult to maintain. The above steps are completed by using the RF coaxial cable. The transmission of the modulated signal ensures the strength of the transmitted satellite signal, which reduces the cost and maintenance difficulty of the connection line between the RGSSS antenna and the base station.

In the case that the transmitting device is an RGSSS antenna and the receiving device is a base station, in a preferred embodiment, the RGSSS antenna demodulates the received satellite signal to obtain a signal to be transmitted, and the RGSSS antenna modulates the obtained signal to be transmitted. For a modulated signal that is convenient for transmission on a radio frequency coaxial cable, it should be noted that there are many ways in which the RGSSS antenna can modulate the transmitted signal. As an example, in a preferred embodiment, the RGSSS antenna will be different. The signals to be transmitted are modulated to different frequencies. Thereby, the speed and accuracy of each signal to be transmitted can be guaranteed.

Specifically, in another preferred embodiment, the RGSSS antenna modulates a timing pulse signal and a Time Of Day (TOD) message output by the global satellite navigation system GNSS receiver in the RGSSS antenna. The timing pulse signal and the TOD time message belong to the timing signal, thereby realizing the timing of one or more base stations covered by the satellite, and ensuring absolute alignment of time phase or clock frequency synchronization between the base stations.

In the case that the transmitting device is a base station and the receiving device is an RGSSS antenna, in a preferred embodiment, the transmitting device modulating the signal to be transmitted includes: the base station modulates a control signal to be sent to the RGSSS antenna. Among them, the control signal can be understood as a series of messages, mainly used to query or set the state and parameters of the satellite signal demodulation, such as: the satellite signal strength received by the RGSSS antenna, the number of locked satellites, the latitude and longitude, etc. Query, or control RGSSS antenna reset, restart, output development messages, and more.

In another preferred embodiment, the transmitting device modulating the information to be transmitted includes: the base station coupling the power source to the RF coaxial cable and transmitting the signal to the RGSSS antenna to provide power to the RGSSS antenna.

A signal transmission system is also provided in this embodiment, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.

4 is a structural block diagram of a signal transmission system according to an embodiment of the present invention. As shown in FIG. 4, the system includes: a remote global satellite navigation system RGSSS antenna 22 and a base station 24, and a first modem unit is disposed in the RGSSS antenna 22. 222, wherein the first modem unit 222 is configured to modulate a signal to be transmitted sent to the base station; the base station 24 is provided with a second modem unit 242, wherein the second modem unit 242 is configured to Modulating the control signal and/or transmitted to the RGSSS antenna, and demodulating the modulated signal to be transmitted received from the RGSSS antenna; the RGSSS antenna and the base station are connected by a radio frequency coaxial cable.

Preferably, the first modem unit 222 is configured to demodulate the received satellite signal to obtain the signal to be transmitted.

Preferably, the first modem unit 222 is further configured to modulate a timing pulse signal and a TOD time message output by the global satellite navigation system GNSS receiver in the RGSSS antenna.

Preferably, the first modem unit 222 is further configured to modulate different signals to be transmitted onto different frequencies.

The above-described problems in the related art will be described below in conjunction with the preferred embodiments, which combine the above-described embodiments and preferred embodiments thereof.

The preferred embodiment provides a satellite timing device (corresponding to the above signal transmission system) based on the improved RGSSS, including:

RGNSS antennas integrate GNSS antennas and GNSS receivers;

The RGSSS antenna further integrates a modulation and demodulation unit, respectively modulates the timing pulse signal and the TOD time message outputted by the GNSS receiver to different frequencies, and transmits the same to the wireless base station through the RF coaxial cable, and the base station demodulates and restores the timing pulse signal, TOD time message;

In another preferred embodiment, the base station modulates the control message to a different frequency and transmits it to the RGSSS antenna through the RF coaxial cable, and the RGSSS antenna demodulates and restores the control message for processing;

In another preferred embodiment, the base station couples the power supply to the modulated signal and transmits it over the RF coaxial cable to the RGSSS antenna from which the RGSSS antenna extracts power and uses it.

The preferred embodiment will be described in detail below with reference to the accompanying drawings.

FIG. 5 is a schematic diagram of a satellite timing device according to an embodiment of the present invention. As shown in FIG. 5, it includes an RGSSS satellite timing antenna, a radio frequency coaxial cable, and a base station.

The RGSSS satellite timing antenna has a built-in GNSS antenna and a GNSS receiver, a modem unit, and is configured to receive satellite signals and parse out timing pulse signals and TOD time information, and respectively modulate them to different frequencies (for example, timing pulse signal modulation to The frequency f1 and TOD time information are modulated to the frequency f2).

The base station is responsible for supplying power to the RGSSS satellite timing antenna, transmitting control message modulation signals (for example, control message modulation to frequency f3), and receiving and demodulating the timing pulse signal and TOD time information sent by the RGSSS satellite timing antenna.

The RGNSS satellite timing antenna and base station use RF coaxial cable to transmit power and modulated signals at various frequencies.

6 is a schematic block diagram of an RGSSS satellite timing antenna according to an embodiment of the present invention. As shown in FIG. 6, the RGSSS satellite timing antenna includes a GNSS antenna, a GNSS receiver, and a modem unit.

7 is a schematic block diagram of a related unit in a base station according to an embodiment of the present invention. As shown in FIG. 7, the PPS signal is a timing pulse signal; the TOD signal is time information; the CMD signal is a control message; and the Power signal is a power supply.

In summary, the novel RGSSS satellite timing device of the present invention provides satellite timing functions for the wireless base station, and solves difficulties such as weak satellite signals, difficult wiring, and inconvenient installation; since the existing RF coaxial cable can be utilized Resources, no need to make special cables, but also reduce the cost of the solution; for the case of the new RF coaxial cable, because the transmission is not a weak satellite signal, it is not sensitive to signal attenuation, so you can use fine RF coaxial Cables further reduce the cost of the solution.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

According to the foregoing technical solution provided by the embodiment of the present invention, the transmitting end device uses a transmitting end device to modulate a signal to be sent; the transmitting end device sends the modulated to-be-sent signal to the receiving end device through a radio frequency coaxial cable, where the transmitting end device is a remote global device. The satellite navigation system RGSSS antenna, the receiving device is the base station; or the transmitting device is the base station, and the receiving device is the RGSSS antenna. In the prior art, when the base station satellite timing is in the RGSNS mode, the cost of the RGSSS is high and the connection is The complex and difficult maintenance of the multi-strand twisted pair cable of the base station and the satellite ensures the strength of the transmitted satellite signal and reduces the cost and maintenance difficulty of the connection line between the RGSSS antenna and the base station.

Claims

A signal transmission method includes:

The transmitting device modulates the signal to be sent;

Transmitting, by the sending end device, the modulated signal to be sent to the receiving end device by using a radio frequency coaxial cable, where the transmitting end device is a remote global satellite navigation system RGSSS antenna, and the receiving end device is a base station; or The sending end device is a base station, and the receiving end device is an RGSSS antenna.
The method according to claim 1, wherein, when the transmitting end device is an RGSSS antenna, and the receiving end device is a base station, the transmitting end device, before modulating the to-be-transmitted signal, includes:

The RGSSS antenna demodulates the received satellite signal to obtain the to-be-transmitted signal.
The method according to claim 2, wherein the transmitting end device modulating the signal to be transmitted comprises:

A timing pulse signal and a time and date TOD message output by the global satellite navigation system GNSS receiver in the RGSSS antenna are modulated.
The method according to claim 2, wherein the transmitting end device modulating the signal to be transmitted comprises:

The RGSSS antenna modulates the signal to be transmitted onto different frequencies.
The method according to claim 1, wherein the transmitting end device is a base station, and when the receiving end device is an RGSSS antenna, the transmitting end device modulating the to-be-transmitted signal includes:

The base station modulates a control signal to be transmitted to the RGSSS antenna, wherein the control signal is used to query or set the status and parameters of the satellite signal demodulation.
The method according to claim 1, wherein the transmitting device is a base station, and when the receiving device is an RGSSS antenna, the base station couples power to the RF coaxial cable and sends the signal to the RGSSS antenna.
A signal transmission system comprising: a remote global satellite navigation system RGSSS antenna and a base station,

A first modem unit is disposed in the RGSSS antenna, where the first modem unit is configured to modulate a signal to be transmitted sent to the base station;

Providing a second modem unit in the base station, wherein the second modem unit is configured to modulate a control signal sent to the RGSSS antenna and receive the signal from the RGSNS antenna The modulated signal to be transmitted is demodulated;

The RGSSS antenna and the base station are connected by a radio frequency coaxial cable.
The system of claim 7 wherein said first modem unit is arranged to demodulate the received satellite signal to obtain said signal to be transmitted.
The system of claim 8 wherein said first modem unit is further configured to modulate a timing pulse signal and a TOD time message output by a global satellite navigation system GNSS receiver of said RGSSS antenna.
The system of claim 8 wherein said first modem unit is further configured to modulate different signals to be transmitted onto different frequencies.