System applied to 5G front-pass semi-active adjustable top

Abstract

The invention relates to the technical field of 5G communication, in particular to a system applied to a 5G forward transmission semi-active adjustable top. Comprising an OAM link layer, an OAM physical layer and an OAM optical layer, the OAM physical layer is arranged between the OAM link layer and the OAM optical layer and used for physical layer processing and optical layer transmission of OAM data, the OAM physical layer comprises an OAM modulation sub-layer and an OAM coding sub-layer, the OAM modulation sub-layer is used for modulating digital information into an optical layer signal and demodulating a digital signal from the optical layer signal, and the OAM coding sub-layer is used for coding the digital signal. The OAM coding sub-layer adopts Manchester coding, and the OAM link layer is used for a packaging process and a de-packaging process of an OAM frame and performing frame synchronization; and low time delay and high reliability can be realized.

Description

Technical Field

[0001] The present invention relates to the field of 5G communication technology, and in particular to a system for semi-active adjustable top applied to 5G fronthaul. Background Art

[0002] As a new generation of mobile communication technology, 5G has the characteristics of large bandwidth, low latency and massive connections. 5G can bring revolutionary service experience to users, develop new business models, and provide new impetus for sustained growth for communication operators. Nowadays, there is a wavelength-adaptive metropolitan access WDM system with port wavelength-independent characteristics, which is suitable for single-channel rates of 10Gbit / s and 25Gbit / s and a maximum number of channels of 12 / 20 / 40 wavelengths. It can be applied to scenarios such as mobile fronthaul and dedicated line access.

[0003] Technical requirements for metropolitan access wavelength division multiplexing (hereinafter referred to as access WDM) systems with port-independent wavelength adaptation characteristics. Wavelength-adaptive metropolitan access WDM systems are applied to the edge access layer of metropolitan area networks and should have port-independent wavelength adaptation characteristics, without the need to manually configure the wavelength / frequency of the tail port. Among them, OAM is an important function of this wavelength division multiplexing system. OAM stands for operation, administration, and maintenance, and mainly completes daily network and business analysis, prediction, testing, and fault management operations. OAM can make the semi-active wavelength division multiplexing system demodulate the top.

[0004] With the rapid development of communication network services, in order to meet the needs of the three major business scenarios of 5G technology, fronthaul technology needs to comprehensively consider various factors such as network resources, cost and technology maturity to meet the requirements of low latency and high reliability. However, the analysis of existing fronthaul technology cannot meet the long-term low latency and high reliability requirements of existing network services. Based on the above problems, a 5G fronthaul semi-active adjustable top system that can meet low latency and high reliability is urgently needed. Summary of the invention

[0005] According to the analysis of the current fronthaul technology, it cannot meet the long-term low latency and high reliability requirements of existing network services. The present invention provides a semi-active adjustable top system applied to 5G fronthaul to solve the above problem.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: The embodiment of the present application discloses a system for 5G fronthaul semi-active adjustable top, including: an OAM link layer, an OAM physical layer and an OAM optical layer. The OAM physical layer is arranged between the OAM link layer and the OAM optical layer, and is used for physical layer processing of OAM data and entering the optical layer for transmission. The OAM physical layer includes an OAM modulation sublayer and an OAM coding sublayer. The OAM modulation sublayer is used to modulate digital information into an optical layer signal and demodulate a digital signal from the optical layer signal. The OAM coding sublayer adopts Manchester coding. The OAM link layer is used for the encapsulation process and decapsulation process of the OAM frame and performs frame synchronization.

[0007] Preferably, the encapsulation process includes: after the OAM link layer obtains the OAM payload content from the OAM service layer, encapsulation is performed according to the OAM frame format.

[0008] Further preferably, the modulation mechanism of the OAM modulation sublayer is an amplitude modulation mechanism, and digital demodulation is performed by judging the high and low signals, wherein the modulation amplitude of the 0 / 1 optical layer signal is , the algorithm formula is: , 3% is the minimum top-modulation depth and 5% is the maximum top-modulation depth. When the top-modulation cost of OAM processing is less than 0.5dB and the optical module receiving optical power is less than 5dB of the optical module receiving sensitivity, the OAM frames of the board and the optical module can be received correctly.

[0009] Further preferably, the OAM link layer supports a data statistics function, and the data statistics function includes: the number of sent and received frames, the data rate, and the number of error frames.

[0010] Further preferably, an OAM service layer is also included, and the OAM service layer supports OAM service configuration function, query function, active reporting function and reflection function.

[0011] Further preferably, it also includes: a service configuration module, wherein the service configuration module is used to perform OAM configuration through the OpenWDM management and control system, and the configuration function of OpenWDM includes configuring optical module loopback, optical module sending optical power and service offline detection.

[0012] Further preferably, it also includes: a query function module, which is used to configure the OAM query function through the OpenWDM management and control system, including querying the received optical power, the transmitted optical power, voltage, temperature, and module manufacturer information.

[0013] Further preferably, it further comprises: an active reporting module, wherein the active reporting module is used for periodic OAM messages actively sent by modules at both ends.

[0014] Further preferably, it also includes: a reflection function module, after the optical module receives the OAM information from the opposite end, it reflects the information and sends it to the opposite end.

[0015] Further preferably, it also includes an OAM module state, and the OAM module state includes a frame synchronization and a normal OAM transceiver state; the module first performs frame synchronization, sends a keeplive synchronization message or other actively reported messages in the frame synchronization state, and after receiving five correct OAM messages in succession, starts to normally transceive OAM messages and sends OAM messages on demand; if three OAM frame errors are received in succession, a frame loss alarm is generated and the module enters a frame synchronization state; in the frame synchronization state, the keeplive synchronization message or actively reported message is continuously sent to try to re-enter the OAM transceiver state.

[0016] Technical effect: The above solution provides a new system for 5G fronthaul semi-active adjustable top. OAM configuration is performed through the OpenWDM management and control system. The OpenWDM OAM configuration function includes configuring optical module loopback, optical module sending optical power and service offline detection. After receiving the configuration command, the remote end is required to feedback the configuration result within 1 second, and the optical module needs to get the configuration result within 3 seconds. The accuracy of optical module OAM information; the transmit and receive optical power accuracy error is less than or equal to ±2db; the temperature accuracy error is less than or equal to ±3℃; the voltage accuracy error is less than or equal to ±3%; the current accuracy error is less than or equal to ±10%; it can meet low latency and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is the OAM technical architecture diagram for this application; Figure 2 This is the link layer state flow chart for this application; Figure 3 This is the overall architecture diagram of Open-WDM control for this application.

[0019] In the figure: 1. OAM link layer; 2. OAM physical layer; 3. OAM optical layer; 4. OAM modulation sublayer; 5. OAM coding sublayer; 6. OAM service layer; 7. Service configuration module; 8. Query function module; 9. Active reporting module; 10. Reflection function module. DETAILED DESCRIPTION

[0020] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0021] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0022] See also Figure 1-Figure 3 With the rapid development of communication network services, in order to meet the needs of the three major business scenarios of 5G technology, fronthaul technology needs to comprehensively consider various factors such as network resources, cost and technical maturity to meet the requirements of low latency and high reliability. However, the analysis of existing fronthaul technology cannot meet the long-term low latency and high reliability requirements of existing network services. Based on this, the embodiment of the present application discloses a system for semi-active adjustable top for 5G fronthaul, including: an OAM link layer, an OAM physical layer and an OAM optical layer. The OAM physical layer is arranged between the OAM link layer and the OAM optical layer, and is used for physical layer processing of OAM data and entering the optical layer for transmission. The OAM physical layer includes an OAM modulation sublayer and an OAM coding sublayer. The OAM modulation sublayer is used to modulate digital information into an optical layer signal and demodulate a digital signal from an optical layer signal. The OAM coding sublayer adopts Manchester coding. The OAM coding sublayer adopts Manchester coding. 0 is represented by a low-high level jump, and 1 is a high-low level jump.

[0023] The OAM link layer is used for the encapsulation and decapsulation processes of the OAM frames and for frame synchronization.

[0024] The above scheme includes the OAM link layer status host, and the OAM module status includes frame synchronization and normal OAM transceiver status. The module first performs frame synchronization, sends keeplive synchronization messages or other active reporting messages in the frame synchronization state, and starts to send and receive OAM messages normally after receiving 5 correct OAM messages in succession, and sends OAM messages on demand. If 3 OAM frame errors are received in succession, a frame loss alarm is generated and the frame synchronization state is entered. In the frame synchronization state, keeplive synchronization messages or active reporting messages are continuously sent to try to re-enter the OAM transceiver state.

[0025] The encapsulation process includes: after the OAM link layer obtains the OAM payload content from the OAM service layer, encapsulation is performed according to the OAM frame format.

[0026] The modulation mechanism of the OAM modulation sublayer is an amplitude modulation mechanism, which performs digital demodulation by judging the high and low signals, where the modulation amplitude of the 0 / 1 optical layer signal is , the algorithm formula is: , 3% is the minimum top-modulation depth and 5% is the maximum top-modulation depth. When the top-modulation cost of OAM processing is less than 0.5dB and the optical module receiving optical power is less than 5dB of the optical module receiving sensitivity, the OAM frames of the board and the optical module can be received correctly.

[0027] The OAM link layer supports data statistics functions, which include: the number of sent and received frames, data rate, and the number of error frames.

[0028] It also includes an OAM service layer, which supports OAM service configuration function, query function, active reporting function and reflection function.

[0029] It also includes: a service configuration module, which is used to perform OAM configuration through the OpenWDM management and control system. The configuration functions of OpenWDM include configuring optical module loopback, optical module sending optical power and service offline detection, etc. After the remote end receives the configuration command, it is required to feedback the configuration result within 1 second, and the optical module needs to get the configuration result within 3 seconds.

[0030] It also includes: a query function module, which is used to configure the OAM query function through the OpenWDM management and control system, including querying the received optical power, transmitted optical power, voltage, temperature, and module manufacturer information.

[0031] All query function messages are initiated by the DU side module at the central office and responded by the remote AAU. After the central office sends a query message, the remote end should send a response message within 1 second. If the remote end receives a query message while sending other messages (such as active reporting messages), it needs to wait until the current message is sent before responding to the query message.

[0032] It also includes: an active reporting module, which is used for the periodic OAM messages actively sent by the modules at both ends; the message information content includes keeplive, LOS alarm, voltage and temperature abnormality alarm, and module manufacturer information. In the case of module LOS, the active reporting message is sent normally according to the cycle.

[0033] It also includes: a reflection function module. After the optical module receives the OAM information from the other end, it will reflect the information and send it to the other end. The other end optical module receives the reflected OAM information and does not forward it. The reflected message includes: LOS alarm of the active report message, abnormal alarms such as voltage and temperature, module status information, and module information.

[0034] See also Figure 2 , and also includes the OAM module status, which includes frame synchronization and normal OAM transceiver status; the module first performs frame synchronization, sends keeplive synchronization messages or other active reporting messages in the frame synchronization state, and starts to send and receive OAM messages normally after receiving 5 correct OAM messages in succession, and sends OAM messages on demand; if 3 OAM frame errors are received in succession, a frame loss alarm is generated and the module enters the frame synchronization state; in the frame synchronization state, keeplive synchronization messages or active reporting messages are continuously sent to try to re-enter the OAM transceiver state. This design can meet the requirements of low latency and high reliability.

[0035] The OAM information accuracy of the optical module mentioned above is that the transmit and receive optical power accuracy error is less than or equal to ±2db; the temperature accuracy error is less than or equal to ±3℃; the voltage accuracy error is less than or equal to ±3%; and the current accuracy error is less than or equal to ±10%.

[0036] The optical module needs to support OAM information security. By configuring the OAM information security code, the configuration function of the optical module's OAM information is enabled. The OAM information security code is 0X2021222324252627+module ID. The OAM information security code of the optical module is divided into local security code and remote security code. If the local security code is correct, local OAM information operations can be performed and OAM content can be configured. When configuring a remote module, you need to send the remote security code first. After the remote module verifies (consistent with the local security code), it will feedback an ACK message. Only then can the test module perform remote configuration operations. When the security codes are inconsistent, the test module feedbacks that the configuration is unsuccessful and does not perform the configuration operation. The security code status needs to be cleared when the module is powered on. The configuration function requires the configuration of the security code. After the function configuration is completed, the security code configuration needs to be cleared. By default, the security code is valid for 10 minutes.

[0037] Semi-active central office WDM equipment should have interfaces and functions to connect to the network management server in order to achieve unified and centralized management of the fronthaul network.

[0038] Semi-active WDM equipment should have network management system management functions to achieve graphical management and display of network topology, equipment and module information. The management scale should be at least no less than 10,000 local-end devices.

[0039] The network management system of semi-active WDM equipment should support line fault monitoring, channel fault monitoring and module status monitoring.

[0040] Through the network management graphical management and alarm events, the supported alarms and performance parameters are shown in Table 1.

[0041] Table 1 Alarm and performance parameter list

[0042] Fault management should be able to diagnose and locate faults in the WDM system. The network element management system should at least support the following alarm functions: The system should be able to identify all faults and locate them; Alarm monitoring, alarm type (see Table 1); It should have current and historical alarm records. It should be able to report all alarm signals and their recorded details, including alarm generation time, alarm source, alarm level, alarm reason, etc. It should have audible and visual alarm indications; With alarm confirmation and clearing functions: including confirmed, unconfirmed, cleared, and not cleared; Alarm history records should be able to be viewed, counted and output to external devices; It has the functions of alarm filtering and alarm shielding; Ability to set alarm severity level, which is divided into emergency alarm, major alarm, minor alarm, and prompt alarm.

[0043] The network management system should have the following performance management functions: Performance monitoring, performance monitoring parameters; Setting performance monitoring thresholds, such as wavelength thresholds and power thresholds, generates performance over-limit alarms when performance values ​​exceed the threshold range; Ability to set performance data collection on or off for different terminal points; Supports storage of "current" and "recent" performance data. Performance reports can be dumped to external storage devices in the form of files, etc. It should have the function of analyzing and statistically analyzing performance data and should display the statistical results of performance monitoring parameters in intuitive tables and graphs such as line graphs, histograms, pie charts, etc.

[0044] The network management system should provide the following configuration management functions: NE initialization configuration query, including NE name, NE address, user data, single disk, etc.; Establish and modify network topology diagrams, and support the display of topology elements such as network elements and optical links; Configure and monitor the status of network elements, including management status, communication status, availability status, etc. Supports configuration and modification of network element protection mode and control of protection switching status. Protection switching action types include: Start / release forced protection switching; Start / release manual protection switching.

[0045] Network element time management should support manual or automatic time setting for single or multiple network elements; The configuration of the actual network should be able to be completed graphically on the network element management system screen according to user request.

[0046] Security management should at least provide the following management functions: Operation level and authority division; User management; Log management, including various system logs and operation records; Management area division; It should be possible to monitor and control all applications that attempt to access restricted resources.

[0047] See also Figure 3 , Open-WDM overall control architecture, the fronthaul centralized control system manages the transmission equipment downward through the Netconf standard southbound interface, and the southbound interface meets the requirements of QB xx-xx "OpenWDM Control Southbound Interface Technical Specification". Type I, II, and III local-end equipment should have GE optical ports and support the use of GE optical ports as network management interfaces to connect with SPN devices at the same site to achieve control signaling interoperability.

[0048] Unless otherwise specified, the device components involved in the above embodiments are all conventional device components, and the connection methods and control methods involved are all conventional connection methods and control methods unless otherwise specified.

[0049] The present invention has been described in detail above in conjunction with the embodiments. However, those skilled in the art will appreciate that, without departing from the spirit of the present invention, the specific parameters in the above embodiments may be changed to form a plurality of specific embodiments, which are all within the common variation range of the present invention and will not be described in detail herein.

Claims

1. A system for semi-active adjustable top for 5G fronthaul, characterized in that: include: An OAM link layer, an OAM physical layer and an OAM optical layer. The OAM physical layer is arranged between the OAM link layer and the OAM optical layer, and is used for physical layer processing of OAM data and entering the optical layer for transmission. The OAM physical layer includes an OAM modulation sublayer and an OAM coding sublayer. The OAM modulation sublayer is used to modulate digital information into an optical layer signal and demodulate a digital signal from the optical layer signal. The OAM coding sublayer adopts Manchester coding. The OAM link layer is used for the encapsulation and decapsulation processes of OAM frames and for frame synchronization.

2. According to claim 1, a system for semi-active adjustable top for 5G fronthaul is characterized in that: The encapsulation process includes: after the OAM link layer obtains the OAM payload content from the OAM service layer, encapsulation is performed according to the OAM frame format.

3. The system for semi-active adjustable top for 5G fronthaul according to claim 1 is characterized in that: The modulation mechanism of the OAM modulation sublayer is an amplitude modulation mechanism, which performs digital demodulation by judging the high and low signals, where the modulation amplitude of the 0 / 1 optical layer signal is , the algorithm formula is: ， in, is the modulation amplitude of the optical layer signal, is the maximum optical layer signal modulation amplitude, is the minimum optical layer signal modulation amplitude; 3% is the minimum top modulation depth, and 5% is the maximum top modulation depth. When the top modulation cost of OAM processing is less than 0.5dB and the optical module receiving optical power is less than 5dB of the optical module receiving sensitivity, the OAM frames of the board and the optical module can be received correctly.

4. The system for semi-active adjustable top for 5G fronthaul according to claim 1 is characterized in that: The OAM link layer supports a data statistics function, which includes: the number of sent and received frames, the data rate, and the number of error frames.

5. The system for semi-active adjustable top for 5G fronthaul according to claim 1 is characterized in that: It also includes an OAM service layer, which supports OAM service configuration function, query function, active reporting function and reflection function.

6. The system for semi-active adjustable top for 5G fronthaul according to claim 1, characterized in that: Also includes: The service configuration module is used to perform OAM configuration through the OpenWDM management and control system. The configuration functions of OpenWDM include configuring optical module loopback, optical module transmission optical power and service offline detection.

7. The system for semi-active adjustable top for 5G fronthaul according to claim 1, characterized in that: Also includes: The query function module is used to configure the OAM query function through the OpenWDM management and control system, including querying the received optical power, transmitted optical power, voltage, temperature, and module manufacturer information.

8. The system for semi-active adjustable top for 5G fronthaul according to claim 1, characterized in that: Also includes: An active reporting module is used for periodic OAM messages actively sent by modules at both ends.

9. The system for semi-active adjustable top for 5G fronthaul according to claim 1, characterized in that: Also includes: Reflection function module: After receiving the OAM information from the other end, the optical module will reflect the information and send it to the other end.

10. The system for semi-active adjustable top for 5G fronthaul according to claim 1, characterized in that: It also includes the OAM module status, which includes frame synchronization and normal OAM transmission and reception status. The module first performs frame synchronization, sends keeplive synchronization messages or other active reporting messages in the frame synchronization state, and starts to normally transmit and receive OAM messages after receiving 5 correct OAM messages in succession, and sends OAM messages on demand. If three OAM frame errors are received consecutively, a frame out-of-sync alarm is generated and the frame synchronization state is entered; In the frame synchronization state, keeplive synchronization messages are continuously sent or active reporting messages are actively sent to try to re-enter the OAM state.

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