WO2007030998A1

WO2007030998A1 - A fiber access network and communication protecting method thereof

Info

Publication number: WO2007030998A1
Application number: PCT/CN2006/002171
Authority: WO
Inventors: Han Li; Bing Wei; Jianming Zhou
Original assignee: China Mobile Communications Corporation
Priority date: 2005-09-12
Filing date: 2006-08-24
Publication date: 2007-03-22
Also published as: CN1750495A; CN100496002C

Abstract

A fiber access network and communication protecting method thereof, the said fiber access network includes: fiber communication system, wireless communication system and communication service switching device. When the fiber between the optical line terminal in the fiber communication system and the optical network unit is broken off, the communication service is switched by the communication service switching device from the fiber communication system to the wireless communication system; after the fiber malfunction has been eliminated, the communication service then is switched back to the fiber communication system by the communication service switching device. The system construction of the invention is simple, a limitation of resources such as pipeline, cable and so on can be overcome by adopting the invention, and the invention also contributes to the utilization of the communication device, thus the communication service of the fiber communication system is effectively ensured.

Description

Optical fiber access network and communication protection method thereof

The invention relates to a fiber access network and a communication protection method thereof, in particular to a fiber access network having a communication protection function capable of providing wireless communication protection in the event of a fiber failure, and ensuring communication when a fiber breakage occurs. A communication protection method that is performed unaffected by the service. Background technique

The use of fiber access networks is an inevitable trend in the development of fiber-optic communications. The topologies of fiber-optic access networks usually have five types: single-star, multi-star, tree, bus, and ring. For the first four, they can be collectively referred to as stars. Shape structure. Compared with ring networks and point-to-point systems, the star network can save a large number of fiber and optical transceiver modules, and its branch structure is easy to cover. Therefore, for fiber access networks, a star structure is generally adopted.

In the fiber access network, in order to ensure the normal operation of the communication service, the optical fiber line is usually protected. The protection modes are as follows:

1. It is protected by the same cable splitting mode, that is, the primary and backup optical fibers are provided in the same optical cable. When the primary optical fiber is cut, the backup optical fiber can be enabled. However, when the entire optical cable is cut off, this method cannot be used. Ensure the normal operation of the communication service.

2, using the same way to protect the cable, that is, in the same pipe or route, the main and backup fibers are in different optical cables, so that when the fiber optic cable where the main fiber is located is cut off, the backup fiber can be enabled, but this way It can only protect the general cable cut-off fault, but can not prevent large-scale faults, such as large-scale accidents of cutting off the cable duct due to the construction of large machinery.

3. The sub-cable split mode is used for protection, that is, the main and backup optical fibers are not only different cables, but also the pipes or routes are different. This approach provides maximum protection for fiber optic lines, but it is economically expensive.

However, in existing practical protection applications, due to pipeline, fiber resources and construction costs Restriction, only the above protection mode is used to protect the optical fiber line between the optical line terminal and the optical splitter, and the optical fiber line between the optical splitter and the optical network unit in the star optical access network is rarely protected. Once it has a fiber break failure, it will invalidate network communication.

Many users who are sensitive to tariffs and users who need to exchange real-time network information, although they do not have very strict QOS requirements for the network, can tolerate performance degradation in the network for a short period of time, such as network speed drop, etc., but they can't stand the network for a long time. The interruption. Therefore, adopting an appropriate and effective way to protect the fiber access network is a necessary guarantee for the smooth communication of the user network. Summary of the invention

The main purpose of the present invention is to provide a fiber access network and its communication for the defects of the above-mentioned protection mode of the fiber access network and the reasons and current situation of insufficient protection of the fiber line of the star fiber access network in actual use. The protection method, the fiber access network and the method combine the wireless communication system and the optical fiber communication system, so that the communication service of the optical fiber communication system is strongly guaranteed.

In order to achieve the above object, the present invention provides a fiber access network, including an optical fiber communication system composed of at least an optical line terminal, an optical distribution network, an optical network unit, and a user-side integrated access device, and a wireless base station. a wireless base station is in communication with the optical line terminal; the wireless base station is wirelessly connected to the wireless user equipment; the wireless user equipment and the optical network unit are respectively associated with a communication service switching device for switching the communication line The wireless client device is further connected to the optical network unit, and the communication service switching device is connected to the user integrated access device; the optical network unit is provided with a detection module for detecting a signal and A control module for issuing a handover control signal to the communication service switching device. The detection module may be connected to the control module, and the communication service switching device may be placed inside the optical network unit, that is, integrated with the optical network unit.

The fiber access network can protect communication services between optical line terminals and optical network units in a fiber-optic communication system. Generally, the communication service is performed in a fiber-optic communication system, and when the diaphragm communication system operates, the detection module detects the amplitude, power, and/or energy of the signal transmitted in the fiber-optic communication system. When the amplitude, power and/or energy of the signal is lower than a preset threshold, it is considered that the optical fiber between the optical line communication system and the optical network unit is broken, and the communication service switching device will be the optical fiber communication system. The communication service is switched to the wireless communication system; since the optical fiber communication is superior to the wireless communication system in terms of transmission rate and stability, when the detection module detects that the amplitude, power and/or energy of the signal from the optical line terminal is higher than When the threshold value is set in advance, it is considered that the fiber breakage failure is eliminated in the optical fiber communication system, and then the communication service switching device switches the communication service from the wireless communication system back to the optical fiber communication system.

The invention adopts a wireless communication system to protect the optical fiber line of the star fiber access network, has a simple structure, can detect faults in time and can effectively switch between communication systems, and satisfies the user's demand for network unavailable time, and Compared with the protection scheme of the fiber-optic line without protection or 1+1 cable protection of the current star fiber access network, it not only breaks the limitation of pipeline and optical cable resources, but also greatly reduces the investment and operation and maintenance costs, and can also be used without the optical cable. The place uses the wireless method to quickly cover the communication area. After the cable is laid, the wireless communication system can be used as the protection system of the fiber-optic communication system, which is beneficial to the step-by-step implementation and the benefit of the equipment, the popularity of the star optical network, and the guarantee of users. In particular, the smooth flow of communication services for group users is very beneficial.

The following further describes the specific embodiments and the drawings of the present invention. DRAWINGS

1 is a system structural diagram of a fiber access network according to the present invention;

2 is a schematic flow chart of switching a communication service from a fiber-optic communication system to a wireless communication system;

Fig. 3 is a flow chart showing the process of restoring a communication service from a wireless communication system to a fiber-optic communication system. detailed description

The main idea of the present invention is to introduce a wireless communication system to an optical line terminal in a star fiber access network. The optical fiber line between the optical network unit and the optical network unit is protected by a fiber optic communication system, a wireless communication system, and a communication service switching device. Under normal circumstances, the communication service is performed in the optical fiber communication system. When the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system is broken, the communication service switching device switches the communication service in the optical fiber communication system to the wireless communication. System; Since optical fiber communication is superior to wireless communication in terms of transmission rate and stability, after the fiber breakage fault is eliminated in the fiber-optic communication system, the communication service switching device switches the communication service from the wireless communication system back to the fiber-optic communication system.

1 is a system structural diagram of a fiber access network according to the present invention. In the fiber access network, the optical fiber communication system includes at least an optical line terminal 1, an optical distribution network 2, an optical network unit 3, and a user terminal integrated access. device. The optical line terminal 1 has an interface with a switching network, a data network, a wireless base station 6, and an optical distribution network 2, and is connected to a switch, a router, a wireless base station 6, and an optical distribution network 1, respectively, to provide necessary means. Transmitting various communication services; the optical distribution network 2 provides the optical network unit 3 and the optical line terminal 1 with the physical connection of the optical fiber as the transmission medium, and redistributes the power after the signals transmitted in the optical fiber are coupled in the coupling region; The network unit 3 is provided with an interface connected to the wireless client device 7 and an interface of the user terminal integrated access device 5, and is connected to the optical distribution network 2 and the communication service switching device 4 for switching the communication line, at least including a detection module 31 for detecting a signal transmitted in the signal fiber communication system, an alarm module 32 for generating a signal loss alarm information when the detection module 31 does not detect the signal, and a switching control signal for transmitting the communication service switching device 4 Control module 33, service interface function module 34 for transmitting and receiving information of the wireless client device 7, and for accessing the optical network unit 3 Power supply and integrated service management and maintenance management function module ^35, wherein the detection module 31 is connected to the alarm module 32 and a power supply and maintenance management module can also be connected to the control module 33, the amplitude can be specific, power, and / or energy other detecting means; alarm module 32 and the service interface function module 34 is connected, service interface function module 34 and the power supply and maintenance management function module ³⁵ and the communication service switch 4 connecting means, and connecting a communication wireless client device 7, the control module 33 is connected to the service interface function module 34 and the power supply and maintenance management function module 35, and is connected to the service interface function module 34 and the communication service switching device 4 The detection module 31 can also be integrally provided with the alarm module 32.

The communication service switching device 4 is configured to switch the communication line, that is, control the connection between the user terminal integrated access device 5 and the optical network unit 3 or the wireless client device 7, so that the control communication service is performed by the optical fiber communication system or the wireless communication system. The switching is controlled by the control module 33 inside the optical network unit 3 through the service interface function module 34, and can be placed independently of the optical network unit 3 or inside the optical network unit 3, that is, integrated with the optical network unit 3. The switching device may specifically adopt an electric switch, an optical switch, a photoelectric switch, a micro mechanical switch or an optical waveguide switch. In a default state, that is, when the optical fiber line of the optical fiber communication system works normally, the user terminal is integrated into the device 5 and the light. The network unit 3 is connected, and the user terminal integrated access device 5 is connected to the wireless client device 7 when the optical fiber is broken.

The wireless communication system includes a wireless base station 6 and a wireless client device 7, wherein the wireless base station 6 is in communication connection with the input end of the optical line terminal 1, wirelessly communicates with the wireless client device 7, performs wireless transmission and reception, and wireless resource management, etc. It may be a point-to-point system or a point-to-multipoint system, such as a WiMax system; the wireless client device 7 has an interface connected to the optical network unit 3 and the user terminal integrated access device 5, and is used for the communication line The switched communication service switching device 4 is connected, communicates with the optical network unit 3, realizes information transmission and reception with the optical network unit 3, and realizes information transmission between the wireless base station 6 and the user terminal integrated access device 5.

The power meter and/or energy meter detects the power and/or energy of the signals transmitted in the fiber optic communication system while the fiber optic communication system is operating. When the power and/or energy of the signal is lower than a preset threshold, it is considered that the optical fiber between the optical line terminal and the optical network unit in the optical fiber communication system is broken, and the communication service switching device switches the communication service from the optical fiber communication system to Wireless communication system. FIG. 2 shows a specific process of the present invention for switching a communication service from a fiber-optic communication system to a wireless communication system, and performing the following steps:

Step 201: The power meter detects that the power of the signal transmitted in the optical fiber communication system is less than a preset threshold power, and considers that the signal is lost.

Step ² 02, the power meter sends the information of the lost signal to the alarm module; Step 203: The alarm module transmits the signal loss alarm information to the wireless client device. Step 204: The wireless client device sends the information requesting the allocated bandwidth to the wireless base station. Step 205: The wireless base station allocates the corresponding bandwidth to the wireless client device, and sends the Confirmation information that the bandwidth has been allocated;

Step 206: The wireless client device sends, to the control module, request information for switching the communication service to the wireless communication system.

Step 207, the control module sends a switching control signal to the optical switch.

Step 208: The electrical switch switches the communication line connected to the optical network unit to the wireless user equipment according to the switching control signal sent by the control module, so that the uplink signal of the communication service is switched to the wireless user equipment;

Step 209: The wireless client device transmits the uplink signal to the wireless base station.

Step 210: The radio base station sends the downlink signal to the corresponding wireless user equipment to complete the handover of the communication service line.

Wherein, after the power meter in the optical network unit detects that the power of the signal is less than the set threshold power, the power meter directly sends the signal loss information to the control module, and the control module controls the optical switch to switch the communication service to the wireless communication. The system proceeds, that is, steps 202 to 206 can be omitted.

After the fiber breakage fault between the optical line terminal and the optical network unit is repaired in the fiber-optic communication system, since the downlink direction is the broadcast mode, the power meter and/or the energy meter can detect the power of the signal transmitted in the fiber-optic communication system and/or Or the energy is higher than the preset threshold power, and it is considered that the signal from the optical line terminal is received, and the communication service switching device switches the communication service from the wireless communication system back to the optical fiber communication system. FIG. 3 shows a specific process of the present invention for switching a communication service from a wireless communication system back to a fiber-optic communication system, and performing the following steps:

Step 301: The power meter detects that the power of the signal is higher than a preset threshold power, and considers that the signal is received;

Step 302: The power meter sends the information of the received signal to the alarm module.

Step ³ 03: The alarm module sends a signal for releasing the loss of the signal to the wireless client device. Step 304, the wireless client device sends the bandwidth #put request information to the wireless base station; Step 305, the wireless base station # puts the corresponding bandwidth, and sends the bandwidth release confirmation information to the wireless client device;

Step 306: The wireless client device sends, to the control module, request information for switching the communication service to the optical network unit.

Step 307: The control module sends a switching control signal to the optical switch.

Step 308: The electrical switch switches the communication line connected to the wireless client device to the optical network unit according to the switching control signal sent by the control module, so that the uplink signal of the communication service is switched to the optical network unit.

Step 309: The optical network unit transmits the uplink signal of the communication service to the optical line terminal to complete the switching of the communication service line.

Similarly, after the power meter in the optical network unit detects that the power of the signal is higher than the set threshold power, the power meter directly sends the information of the received signal to the control module, and the control module controls the optical switch to control the communication service. Switching to the fiber-optic communication system, that is, steps 302-306 can be omitted.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to be limiting thereof; although the present invention has been described in detail with reference to the preferred embodiments, The spirit of the technical solution of the present invention should be included in the scope of the technical solution claimed by the present invention.

Claims

Rights request

An optical fiber access network, comprising an optical fiber communication system, wherein the optical fiber communication system is provided with an optical line terminal, an optical distribution network, an optical network unit, and a user-side integrated access device, and characterized in that the wireless communication base station further includes a wireless base station. The wireless base station is communicatively coupled to the optical line terminal; the wireless base station is wirelessly connected to the wireless customer premises device; and the wireless customer premises device and the optical network unit are respectively associated with a communication service switching device for switching the communication line The wireless client device is further connected to the optical network unit, and the communication service switching device is connected to the user integrated access device; the optical network unit is provided with a detection module for detecting a signal and A control module for issuing a handover control signal to the communication service switching device.

The optical fiber access network according to claim 1, wherein the communication service switching device and the optical network unit are integrally provided.

3. The fiber access network of claim 1, wherein the detection module is coupled to the control module.

The optical fiber access network according to claim 1, 2 or 3, wherein the optical network unit further comprises an alarm module for generating signal loss alarm information when the detection module does not detect the signal. The alarm module is connected to a service interface function module inside the optical network unit.

The optical fiber access network according to claim 4, wherein the alarm module is integrally provided with the detection module.

6. The fiber optic access network of claim 5, wherein the detection module is an amplitude, power and/or energy detecting device.

A communication protection method for a fiber access network according to any one of claims 1-6, characterized in that the communication service switching device switches the communication service from the optical fiber communication system to the wireless communication system, comprising the steps of:

Step 1: The amplitude, power, and/or energy of the signal detected by the detecting module is less than a preset threshold, and the signal loss information is sent to the control module.

Step ² : The control module sends a handover control signal to the control communication service switching device. Step 3: The communication service switching device switches the communication line connected to the optical network unit to the wireless user equipment according to the switching control signal, so that the uplink signal of the communication service is switched to the wireless user equipment;

Step 4: The wireless client device transmits an uplink signal to the wireless base station.

Step 5: The radio base station sends a downlink signal to the wireless user equipment to complete handover of the communication service line.

The communication protection method for the optical fiber access network according to claim 7, wherein between the steps 1 and 2, the following steps are further provided:

Step 11: The detecting module sends the information that the signal is lost to the alarm module.

Step 12: The alarm module generates a signal loss alarm information, and transmits the information to the wireless client device.

Step 13: The wireless client device sends a request for the bandwidth allocation to the wireless base station. Step 14: The wireless base station allocates a corresponding bandwidth to the wireless user equipment, and sends the acknowledgement information with the bandwidth allocated.

Step 15: The wireless client device sends, to the control module, request information for switching a communication service to a wireless communication system.

The communication protection method for a fiber access network according to claim 7, wherein after the step 5, the communication service switching device switches the communication service from the wireless communication system back to the optical fiber. The communication system, the operation of which includes the following steps:

Step 6: The detecting module detects that the amplitude, power, and/or energy of the signal from the optical line terminal is higher than the preset alarm value, and sends the received signal information to the control module; Step 7 The control module sends a switching control signal to the control module;

Step 8: The communication service switching device switches the communication line connected to the wireless client device to the optical network element according to the switching control signal, so that the uplink signal of the communication service is switched to the optical network unit. Step 9: The optical network unit transmits an uplink signal of the communication service to the optical line terminal, and completes switching of the communication service line.

The communication protection method of the optical fiber access network according to claim 9, wherein between the step 6 and the step 7, the following steps are further provided:

Step 61: The detecting module sends the information about the received signal to the alarm module. Step 62: The alarm module sends a signal loss warning signal to the wireless user equipment.

Step 63: The wireless client device sends bandwidth release request information to the wireless base station. Step 64: The wireless base station releases bandwidth, and sends bandwidth release confirmation information to the wireless client device.

Step 65: The wireless client device sends, to the control module, request information for restoring communication service to the optical fiber communication system.

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