KR20230058780A - A system for supplying a clock to a base station using an optical line - Google Patents

Abstract

A system for supplying a clock to a base station according to an embodiment of the present invention includes a first base station, a first clock supply device generating a first clock signal, and a first backhaul device providing the first clock signal to the first base station. A first integrated station including a, a second base station, a second clock supply device for generating a second clock signal, and a second clock signal provided to the second base station and connected to the first backhaul device to generate the first clock signal. and a second integration station including a second backhaul device providing a second clock signal to the first base station through the first backhaul device when a problem occurs in supply.

Description

A system for supplying a clock to a base station using an optical line}

The present invention relates to a clock supply technology, and more particularly, to a system for supplying a clock to a base station using an optical cable.

With the evolution of the 4th and 5th generation mobile communication networks, various types of networks are appearing to introduce IEEE 1588v2 technology using the network from the traditional GPS method for clock supply.

Compared to 4G service, 5G service requires at least 10 times more facilities to provide base station and in-building (e.g., large-scale indoor facilities such as smart factories and shopping malls) services. For example, when using GPS, it is expected that the investment cost for an antenna, cable, and splitter will be excessive. Therefore, it is expected that time & phase clock supply methods using IEEE 1588v2 technology, which has advantages in terms of scalability and cost, will increase.

In particular, with the start of 5G mobile communication service, base stations are being miniaturized and are being built extensively from basements and indoors to outdoor towers. In the event of a clock failure, it has a huge impact, so perfect clock stability is required.

Due to this service environment, there is a need to build a network capable of providing high-quality backup clocks to stably supply clocks to 5G networks without service interruption.

Korea Patent Publication No. 1833894 Registered on February 23, 2018

An object of the present invention is to supply a clock to a base station using an optical line capable of stably supplying a clock by providing a secondary clock through an optical line connected to an adjacent integrated station even when a failure occurs in the primary clock provided to the base station. It is to provide a system to do this.

A system for supplying a clock to a base station according to an embodiment of the present invention includes a first clock supply device generating a first clock signal and a first backhaul device providing the first clock signal to a first base station. 1 integrated station, a second clock supply device for generating a second clock signal, and providing the second clock signal to a second base station, connected to the first backhaul device, if a problem occurs in the supply of the first clock signal , a second integrated station including a second backhaul device providing the second clock signal to the first base station through the first backhaul device.

The first backhaul device and the second backhaul device are characterized in that they are connected through an optical line.

The second integration station may be located within a preset distance from the first integration station.

The first clock signal and the second clock signal are Time & Phase clock signals that satisfy PRTC (Primary Reference Time Clock) ±100ns (Nano-second).

A system for supplying a clock to a base station according to an embodiment of the present invention includes a clock supply device for generating a clock signal and a backhaul device for providing the clock signal to an interlocked base station, and provides optical communication between the backhaul devices. It includes a plurality of integrated stations connected through lines to form a ring network.

If a problem occurs in the supply of a clock signal from a clock supply device of any one integrated station among the plurality of integrated stations, a backup clock, which is a clock signal generated by a clock supply device of a neighboring integrated station adjacent to the one integrated station. It is characterized in that the backhaul device of the neighboring integrated station transmits a signal to a base station interlocked through the backhaul device of the integrated station having a problem in supplying the clock signal.

The plurality of integrated stations form a main ring topology, and the plurality of integrated stations constituting the main ring topology are sequentially connected according to geographical locations through optical paths between backhaul devices.

The system further includes an integrated station that is individually connected to any one of the plurality of integrated stations forming the main ring topology to form a sub-ring topology. Here, when a plurality of integrated stations forming the sub-ring topology exist, the plurality of integrated stations forming the sub-ring topology are not connected to each other.

The clock signal is characterized in that it is a Time & Phase clock signal that satisfies PRTC (Primary Reference Time Clock) ±100ns (Nano-second).

According to the present invention, it is possible to provide stable operation of a large-scale communication facility using an optical line by constructing and using a backup for a clock supply device of an adjacent integration station. Moreover, the present invention adds a real-time monitoring processor function of the clock supply device to monitor the presence or absence of abnormalities in the facility in real time, thereby preventing service interruption with a quick response.

1 is a diagram for explaining the configuration of an integrated station in a system for supplying a clock to a base station using an optical line according to an embodiment of the present invention.
2 is a diagram for explaining a system for supplying a clock to a base station using an optical line according to an embodiment of the present invention.
3 is a diagram for explaining a system for supplying a clock to a base station using an optical line according to an additional embodiment of the present invention.
4 is a diagram for explaining a configuration for monitoring clock quality in real time according to an embodiment of the present invention.

Hereinafter, a preferred embodiment in which a person skilled in the art can easily practice the present invention will be described in detail with reference to the accompanying drawings. However, in the detailed description of the operating principle of the preferred embodiment of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. This is to more clearly convey the core of the present invention without obscuring it by omitting unnecessary description. In addition, since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description, but this is not intended to limit the present invention to specific embodiments, It should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Additionally, when an element is referred to as being “connected” or “connected” to another element, it means that it is logically or physically connected or capable of being connected. In other words, it should be understood that a component may be directly connected or connected to another component, but another component may exist in the middle, or may be indirectly connected or connected.

In addition, terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include" or "having" described in this specification are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or the other It should be understood that the above does not preclude the possibility of the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

Now, an embodiment of the present invention will be described in detail with reference to the drawings. At this time, the same reference numerals are used for parts having similar functions and actions throughout the drawings, and overlapping descriptions thereof will be omitted. In addition, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form centering on core functions of each structure and device.

First, a system for supplying a clock to a base station using an optical line according to an embodiment of the present invention will be described. 1 is a diagram for explaining the configuration of an integrated station in a system for supplying a clock to a base station using an optical line according to an embodiment of the present invention. 2 is a diagram for explaining a system for supplying a clock to a base station using an optical line according to an embodiment of the present invention. 3 is a diagram for explaining a system for supplying a clock to a base station using an optical line according to an additional embodiment of the present invention.

Referring to FIG. 1, a system for supplying a clock to a base station (hereinafter referred to as a clock supply system) according to an embodiment of the present invention includes a plurality of integrated stations 10. One integrated station 10 is for supplying a clock to the base station 300, for example, DU-H. The base station 300 needs to be supplied with a time & phase clock to use the 5G service. Accordingly, the integrated station 10 provides the time phase clock to the base station 300 . To this end, the integrated station 10 includes a clock supply device 100 and one or more backhaul devices 200 .

The clock supply device 100 is for generating a time phase clock (Time & Phase Clock). This clock supply device 100 applies IEEE 1588v2 to generate a time phase clock (Time & Phase Clock). The clock supply device 100 may be a GM (Grand Master) clock supply device. More specifically, the base station 300 needs to be supplied with a time-phase clock through a packet using IEEE 1588v2 technology within a clock quality time error (TE) tolerance of ±1,500 ns in a network section. Therefore, the clock supply device 100 interworks with the backhaul device 200 according to IEEE 1588v2 to provide a primary time phase clock whose clock provision quality satisfies PRTC (Primary Reference Time Clock) ±100ns (Nano-second) through packets. to provide.

The backhaul device 200 provides the clock generated by the clock supply device 100, that is, the time phase clock, to the base station 300 connected through packets. The backhaul device 200 may be any one of IP Virtual Center (IVC), IP BackHaul Center (IBC), IP Virtual Remote (IVR), and IP BackHaul Remote (IBR).

On the other hand, when the clock cannot be supplied to the base station 300 due to hardware or software problems of the clock supply device 100, all base stations 300 accommodated in the backhaul device 200 of the integrated station 10 provide voice and data 5G Service provision becomes impossible. In order to prevent such a problem, the integrated station 10 may be provided with an extra clock supply device 100 or, if a problem occurs due to additionally installing a GPS, the extra clock supply device 100 may be operated as an alternative. However, this method has a problem in that installation and construction costs are more than doubled. In addition, supplementally, it is possible to set a second clock to be supplied through packets through an interface interlocked by an upper-level backhaul device (IVC) installed in an upper station (exchange office, not shown) of the integration station 10. do. In this case, in the case of the integrated station 10, which is more than 30Km away from the exchange center due to the nature of 5G, when using interface 100G or higher service, direct line connection is not possible, so the backhaul device (IVC (IBC)) and the integrated station 10 It is necessary to additionally install a ROTN/ROADM device (not shown) so that interworking between backhaul devices (IVR (IBR)) is possible. When a clock is supplied to the base station 300 installed in the integrated station 10 via the ROTN/ROADM device through a line linked to such a 100G or 10G interface, unlike voice or data traffic, clock traffic (Time & Phase Clock Traffic) A clock quality (TE) deterioration phenomenon occurs due to synchronization delay (Sync.

Therefore, in order to overcome the problems of the various methods described above, the present invention connects the backhaul device 200 of the integrated station 10 adjacent to each other through an optical line, and supplies a second clock (Time & Phase Clock) through the connected optical line. propose a way to

Specifically, referring to FIG. 2, the clock supply system according to an embodiment of the present invention includes a plurality of integrated stations 10: 11 and 12, that is, a first integrated station 11 and a first integrated station 11. At least one second integrating station 12 adjacent to. Here, the second integrating station 12 is located within a predetermined distance from the first integrating station 11 .

The first integrated station 11 is basically for supplying a clock to the first base station 301 . To this end, the first integration station 11 includes a first clock supply device 101 and a first backhaul device 201 . The first clock supply device 101 generates a first clock signal. The first clock signal is a time phase clock whose clock provision quality satisfies PRTC (Primary Reference Time Clock) ±100 ns (Nano-second). The first backhaul device 201 provides the first clock signal generated by the first clock supply device 101 to the first base station 301 .

The second integrated station 11 is basically for supplying a clock to the second base station 301 . The second clock supply device 102 generates a second clock signal. The second clock signal is a time phase clock whose clock provision quality satisfies PRTC (Primary Reference Time Clock) ±100 ns (Nano-second). The second backhaul device 202 provides the second clock signal generated by the second clock supply device 102 to the second base station 302 .

In particular, according to an embodiment of the present invention, the first backhaul device 201 and the second backhaul device 202 are connected through an optical fiber (OF). Accordingly, the second backhaul device 202 transmits the second clock signal generated by the second clock supply device 102 when a problem occurs in supplying the first clock signal generated by the first clock supply device 101. It can be provided to the first base station 301 through the first backhaul device 201 . Conversely, when a problem occurs in the supply of the second clock signal generated by the second clock supply unit 102, the first backhaul device 201 transmits the first clock signal generated by the first clock supply unit 101. It can be provided to the second base station 302 through the second backhaul device 202 .

As described above, according to the present invention, when a hardware or software failure or error occurs in the backhaul device 100 of one integrated station 10, the backhaul device 100 of the adjacent integrated station 10 can be immediately replaced by the clock generated by Accordingly, the base station 300 can be operated without service interruption by supplying the secondary clock when the supply of the primary clock is stopped. In particular, since the backhaul devices 200 of the integrated stations 10 adjacent to each other are connected through the optical line (OF), the transmission of the clock signal is possible without signal distortion, delay, or packet loss due to the characteristics of the optical line (OF). do.

Referring to FIG. 3 , according to an additional embodiment of the present invention, when it is assumed that each of the plurality of integrated stations 10 is a node of a network, the plurality of integrated stations 10 are connected to a ring network ( ring network). Accordingly, the plurality of integrated stations 10 can basically form a main ring topology. According to the geographic location of the plurality of integrated stations 10 constituting the main ring topology, they are sequentially connected to adjacent integrated stations 10 . At this time, the backhaul devices 200 of the integrated stations 10 adjacent to each other are connected through the optical line OF. For example, first, second and third integrating stations 10 shown in FIG. 3 represent integrating stations 10 forming part of the main ring topology. As shown, the first, second and third integrating stations 11, 12 and 13 forming the main ring topology are sequentially connected. That is, the backhaul device 200 of the first integration station 11 and the backhaul device 200 of the second integration station 12 are connected through the first optical line OF1, that is, the second integration station 12 The backhaul device 200 of ) and the backhaul device 200 of the third integration station 13 are connected through the second optical line OF2.

Additionally, an integrated station 10 forming a sub-ring topology may be further included in addition to the plurality of integrated stations 10 forming the main ring topology. The integrated stations 10 forming the sub-ring topology are individually connected to any one integrated station 10 forming the main ring topology. However, the integrated station 10 forming the sub-ring topology may be plural. In this case, the plurality of integrated stations 10 forming the sub-ring topology are not connected to each other.

For example, the fourth and fifth integrated stations 14 and 15 shown in FIG. 3 represent integrated stations 10 forming a sub-ring topology. As shown, the fourth integrating station 14 is connected to the first integrating station 11 and the fifth integrating station 15 is connected to the second integrating station 12 . However, the fourth integrating station 14 and the fifth integrating station 15 are not connected to each other. That is, the backhaul device 200 of the first integration station 11 and the backhaul device 200 of the fourth integration station 14 are connected through the third optical line OF3, and the second integration station 12 Although the backhaul device 200 and the backhaul device 200 of the fifth integration station 15 are connected through the fourth optical line OF4, the backhaul device 200 of the fourth integration station 14 and the fifth integration station The backhaul device 200 of (15) is not connected (NC).

Each of the plurality of integrated stations 10 constituting the ring network includes a clock supply device 100 and a backhaul device 200. As described above, basically, the clock supply device 100 generates a clock signal, and the backhaul device 200 transfers the clock signal to the interlocked base station 300 . However, if a problem occurs in the supply of the clock signal of the clock supply device 100 of any one integrated station 10 among the plurality of integrated stations 10, the neighboring integrated station adjacent to any one integrated station 10 The backup clock signal generated by the clock supply device 100 in (10) is transferred to the backhaul device 200 of the integrated station 10 having a problem in supplying the clock signal to the backhaul device 200 of the neighboring integrated station 10. It is provided to the corresponding base station 300 through ). Such a backup clock signal may be transferred to an adjacent integrated station 10 using a local priority (PTP Local-Priority) scheme. The local priority (PTP Local-Priority) is a parameter set in the backhaul device 200 that receives the backup clock signal, and according to this parameter setting, the backup clock signal can be received with priority over the hop count. there is.

Meanwhile, according to an embodiment of the present invention, clock quality can be monitored in real time. 4 is a diagram for explaining a configuration for monitoring clock quality in real time according to an embodiment of the present invention.

2 and 4, for real-time monitoring of the clock quality of the clock supply device 100 according to an embodiment of the present invention

A monitoring probe is connected between the clock supply device 100 and the backhaul device 200. These monitoring probes include a first monitoring probe (P1) and a second monitoring probe (P2). These monitoring probes P1 and P2 connect the clock supply device 100 and the backhaul device 200 through OJC (Optical Connector, Optical Jumper Cord).

As shown, the first monitoring probe P1 is for measuring an oscillation rate relative to the GPS signal input through the splitter 110 . Accordingly, the backhaul device 200 monitors the quality of the clock by measuring the oscillation rate relative to the GPS signal through the first monitoring probe P1.

In addition, the second monitoring probe P2 is for measuring the clock of the clock supply device 100 and the backhaul device 200 against the GPS signal. Accordingly, the backhaul device 200 measures the clock (Time & Phase Clock) of the clock supply device 100 and the backhaul device 200 against the GPS signal through the second monitoring probe P2 to monitor the quality of the clock.

Referring again to FIG. 2 , Open Shortest Path First (OSPF) and Bidirectional Forwarding Detection (BFD) may be applied to an optical line (OF) between integrated stations 10 . By applying such open shortest path first (OSPF), it is possible to provide the same level of detection function as ring open detection. In addition, by applying BFD, it is possible to recognize whether an OSPF neighbor down occurs when a packet is dropped 4 times in 50 ms consecutively. To this end, and for the backhaul device 200, an interface IP may be additionally set. That is, by setting the interface IP for the backhaul device 200, ARP (Address Resolution Protocol) information can be provided, and OSPF and BFD functions can be provided.

Meanwhile, the method according to an embodiment of the present invention may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. Such a computer-readable recording medium may include program commands, data files, data structures, etc. alone or in combination, and includes all types of recording devices storing data that can be read by a computer system. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROMs (Compact Disk Read Only Memory) and DVDs (Digital Video Disks). Optical media), magneto-optical media such as floptical disks, and program instructions such as ROM (Read Only Memory), RAM (RAM, Random Access Memory), flash memory, etc. and a hardware device specially configured to do so. In addition, the computer-readable recording medium is distributed in computer systems connected through a network, so that computer-readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the technical field to which the present invention belongs.

Although the above has been described and illustrated in relation to preferred embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as shown and described in this way, without departing from the scope of the technical idea. It will be readily apparent to those skilled in the art that many changes and modifications can be made to the present invention. Accordingly, all such appropriate changes and modifications and equivalents should be regarded as falling within the scope of the present invention.

The present invention relates to a system for supplying a clock to a base station using an optical cable. Even if the primary clock provided to the base station fails, the secondary clock is supplied through an optical cable connected to an adjacent integrated station. By providing the clock, it is possible to stably supply the clock. As such, the present invention can provide stable operation of a large-scale communication facility using an optical line by constructing a backup for the clock supply device of an adjacent integrated station. Moreover, the present invention adds a real-time monitoring processor function of the clock supply device to monitor the presence or absence of abnormalities in the facility in real time, thereby preventing service interruption with a quick response. The present invention has industrial applicability because it is not only commercially available or commercially viable, but also realistically and clearly practicable.

10, 11, 12, 13, 14, 15: United States
100, 101, 102: clock supply device
110: distributor
200, 201, 202: backhaul device
300, 301, 302: base station

Claims (8)

a first integrated station including a first clock supply device generating a first clock signal and a first backhaul device providing the first clock signal to a first base station;
A second clock supply device for generating a second clock signal, providing the second clock signal to a second base station and being connected to the first backhaul device, if a problem occurs in the supply of the first clock signal, the second clock a second integrated station including a second backhaul device providing a clock signal to the first base station through the first backhaul device;
A system for supplying a clock to a base station comprising a. According to claim 1,
The first backhaul device and the second backhaul device
A system for supplying a clock to a base station, characterized in that connected through an optical line. According to claim 1,
The second integrated station is
A system for supplying a clock to a base station, characterized in that located within a predetermined distance from the first integration station. According to claim 1,
The first clock signal and the second clock signal are
A system for supplying a clock to a base station, characterized in that it is a Time & Phase clock signal that satisfies PRTC (Primary Reference Time Clock) ±100ns (Nano-second). A plurality of integrated stations, each including a clock supply device generating a clock signal and a backhaul device providing the clock signal to an interlocked base station, and forming a ring network by connecting the backhaul devices to each other through an optical line; contains,
If a problem occurs in the supply of a clock signal from a clock supply device of one of the plurality of integrated stations, a backup clock, which is a clock signal generated by a clock supply device of a neighboring integrated station, to the one integrated station. The system for supplying a clock to a base station, characterized in that the backhaul device of the neighboring integrated station transmits a signal to a base station interlocked through the backhaul device of the integrated station having a problem in supplying the clock signal. According to claim 5,
The plurality of unified countries
A system for supplying a clock to a base station, characterized in that a main ring topology is formed, and a plurality of integrated stations forming the main ring topology are sequentially connected according to geographical locations through optical paths between backhaul devices. According to claim 6,
Further comprising an integrated station individually connected to any one of the plurality of integrated stations forming the main ring topology to form a sub-ring topology;
A system for supplying a clock to a base station, characterized in that, when there are a plurality of integrated stations forming the sub-ring topology, the plurality of integrated stations forming the sub-ring topology are not connected to each other. According to claim 6,
The clock signal is
A system for supplying a clock to a base station, characterized in that it is a Time & Phase clock signal that satisfies PRTC (Primary Reference Time Clock) ±100ns (Nano-second).

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