CN109995432B - Signal processing device and system - Google Patents
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- H—ELECTRICITY
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- H04B3/00—Line transmission systems
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Abstract
The embodiment of the invention provides a signal processing device. The equipment comprises a signal processing unit and a signal interface unit, wherein the signal interface unit and the signal processing unit are two independent parts and are connected through a movable interface, and the movable interface is a contact type pluggable interface; the signal processing unit is used for analyzing and scheduling the MAC layer of the received signal; the signal interface unit is used for sending the signals processed by the signal processing unit to lower-layer equipment or sending the signals received from the lower-layer equipment to the signal processing unit for processing. A signal processing system is also provided. By using the system, the pluggable component in the signal processing equipment is only required to be replaced by a signal interface unit of a transmission protocol corresponding to a transmission medium, so that the system can meet the requirements of different scenes.
Description
Technical Field
The present invention relates to the field of communication technology, and more particularly, to a signal processing apparatus and system.
Background
In the existing communication System, a traditional Multi-System Operator (MSO) network adopts a front end/branch front end, an edge machine room, an optical Node (Fiber Node, FN) and then a System architecture of a user. The edge machine room is connected with the optical node through star point-to-point analog optical fibers, the optical node is connected with the user through a tree coaxial cable network, and an access network in which the optical fibers and the coaxial cables are mixed is called a Hybrid Fiber-Coax (HFC) network. The MSO provides video service and broadband data service for users through HFC network.
The HFC network mainly implements conversion of an optical-electrical signal through two ways, which currently include technologies such as an Ethernet passive optical network Protocol over Coax (EPoC), an Upstream External-PHY Interface (UEPI), and a Downstream External-PHY Interface (DEPI).
A Data over cable service interface specification protocol (Docsis) is one of the application standards of the HFC network, the Docsis 3.1 version greatly modifies a Physical (PHY) layer on the premise of retaining most of the Media Access Control (MAC) layer functions of the Docsis 3.0 version, the PHY layer uses an Orthogonal Frequency Division Multiple Access (OFDMA) modulation mode for an uplink, and the downlink uses OFDM. And the MAC layer and the PHY layer exchange signals through an uplink interface and a downlink interface.
In order to adapt to different requirements, other networking schemes are provided, a Modulated Cable Modem Termination System (M-CMTS) separates and opens the processing of a PHY layer of a downstream CMTS and the processing of a MAC layer of the CMTS at different positions, or separates and opens the processing of the PHY layer of the upstream CMTS and the processing of the PHY layer of the downstream CMTS and the processing of the MAC layer of the CMTS at different positions, and a processing device of the PHY layer of the CMTS is connected with a processing device of the MAC layer of the CMTS through optical fibers. Each networking scheme requires the use of a specific CMTS PHY layer processing device and CMTS MAC layer processing device.
Disclosure of Invention
The embodiment of the invention provides a signal processing device and a signal processing system, which can solve the problem that a CMTS PHY layer processing device and a CMTS MAC layer processing device are required to be suitable for a specific scene, and avoid waste caused by non-universal hardware resources.
In a first aspect of the embodiments of the present application, a signal processing device, specifically, a remote media access control layer processing device RMD is provided, where an uplink accesses an upper network edge node, and a downlink connects a remote physical layer processing device RPD, the RMD includes a signal processing unit and a signal interface unit, the signal interface unit and the signal processing unit are two independent parts, and are connected by an active interface, where the active interface is a contact-type pluggable interface, such as a threaded socket, a metal dome, or a snap-contact socket; the signal processing unit is used for analyzing and scheduling the MAC layer of the received signal; the signal interface unit is used for sending the signals processed by the signal processing unit to lower-layer equipment or sending the signals received from the lower-layer equipment to the signal processing unit for processing.
In a first implementation manner of the first aspect of the embodiment of the present application, the signal processing unit includes an uplink interface, an analog-to-digital/digital-to-analog converter, and an MAC message processing chip; the uplink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device; the analog-to-digital/digital-to-analog converter is used for converting a signal from analog to digital or from digital to analog; the MAC message processing chip is used for analyzing and scheduling the MAC data message and the MAC control message.
With reference to the first aspect of the embodiment of the present application or the first implementation manner of the first aspect of the embodiment of the present application, in a second implementation manner of the first aspect of the embodiment of the present application, the signal interface unit includes a protocol adapter and a communication interface; wherein, the communication interface is used for receiving or sending signals; the protocol adapter is matched with a transmission protocol supported by the communication interface, and is used for processing the signals received from the signal processing unit, adapting the signals to be the signals which can be sent by the communication interface, and sending the signals received by the communication interface from lower-layer equipment to the signal processing unit after adapting processing.
With reference to the first aspect of the embodiment of the present application or the first implementation manner of the first aspect of the embodiment of the present application, in a third implementation manner of the first aspect of the embodiment of the present application, the parsing and scheduling of the MAC layer is MAC layer message processing specified by a data over cable service interface specification protocol DOCSIS 3.0 or a DOCSIS 3.1 protocol.
In a second aspect of the embodiments of the present application, a signal processing device is provided, and specifically, a remote physical layer processing device RPD is connected upstream to a remote media access control layer processing device RMD and downstream to a CM, where the RPD includes a signal processing unit and a signal interface unit, where the signal interface unit and the signal processing unit are two independent parts, and are connected through a movable interface, where the movable interface is a contact-type pluggable interface, such as a threaded socket, a metal dome, or a snap-contact socket; the signal interface unit is used for sending the signal processed by the signal processing unit to upper-layer equipment or sending the signal received from the upper-layer equipment to the signal processing unit for processing.
In a first implementation manner of the second aspect of the embodiment of the present application, the signal processing unit is configured to perform modulation and demodulation processing of a PHY layer on a received signal.
With reference to the second aspect of the embodiment of the present application or the first implementation manner of the second aspect of the embodiment of the present application, in a third implementation manner of the second aspect of the embodiment of the present application, the signal interface unit includes a protocol adapter and a communication interface; wherein, the communication interface is used for receiving or sending signals; the protocol adapter is matched with a transmission protocol supported by the communication interface, is used for processing the signal received from the signal processing unit and is adapted to the signal which can be sent by the communication interface; and after the signal received by the communication interface from the upper layer equipment is subjected to adaptation processing, the signal is sent to the signal processing unit.
With reference to the second aspect of the embodiment of the present application or the first implementation manner of the second aspect of the embodiment of the present application, in a second implementation manner of the second aspect of the embodiment of the present application, the signal processing unit includes a downlink interface, an analog-to-digital/digital-to-analog converter, and a PHY message processing chip; the uplink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device; the analog-to-digital/digital-to-analog converter is used for converting a signal from analog to digital or from digital to analog; the MAC message processing chip is used for carrying out modulation and demodulation processing on the MAC data message and the MAC control message.
With reference to the second aspect of the embodiment of the present application or the first implementation manner of the second aspect of the embodiment of the present application, in a third implementation manner of the second aspect of the embodiment of the present application, the modulation and demodulation process of the PHY layer is a PHY layer modulation and demodulation process specified by a data over cable service interface specification protocol DOCSIS 3.0 or a DOCSIS 3.1 protocol.
In a third aspect of the embodiments of the present application, there is provided a signal processing system, including: RMD and RPD, wherein the RMD is the MAC layer signal processing device as described above and the RPD is the PHY layer signal processing device as described above; the signal interface unit in the RMD and the signal interface unit in the RPD support the same interface protocol, and the RMD and the RPD are connected through a communication medium corresponding to the interface protocol.
By utilizing the embodiment of the invention, the signal processing device for processing the MAC or PHY layer has the pluggable or replaceable active structure of the internal communication interface, and the signal processing device is inserted with the communication interface module supporting the same protocol, so that the two devices can transmit signals on the corresponding transmission medium, and the waste caused by the non-universality of hardware resources is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below.
FIG. 1 is a schematic diagram of a network architecture;
fig. 2 is a schematic diagram of a network structure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another signal processing apparatus according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a signal processing method according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of another signal processing method according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a conventional network structure. In the network structure, the MAC part and the PHY part of a Cable modem terminal system CMTS are completely separated as two independent devices, the CMTS MAC device can be arranged in a central machine room or a street station and is connected with the CMTS PHY device at the far end through an optical fiber, the CMTS PHY device adopts a distributed structure and can be arranged in a downstairs of a building close to a user home, and each CMTS PHY device is connected with a Cable Modem (CM) with a certain data volume through a coaxial Cable. It should be noted that the locations of the CMTS MAC device and the CMTS PHY device may vary, as long as the CMTS PHY device is closer to the subscriber than the CMTS MAC device.
In the network structure shown in fig. 1, the downstream data of the user side is sent to the CMTS PHY device by the CMTS MAC device through an optical fiber in a Wavelength Division Multiplexing (WDM) manner, the CMTS PHY device demodulates and decodes the downstream data to obtain original downstream data, encodes and modulates the original downstream data to convert the original downstream data into coaxial signals, and sends the coaxial signals to the user device (such as a set-top box and/or a personal computer); the user equipment sends the upstream data, and the CM transmits the upstream data to the CMTS PHY equipment through the coaxial cable, and the upstream data is demodulated and decoded at the CMTS PHY equipment, then the coaxial signals are converted into optical fiber signals through coding and modulation, and then the optical fiber signals are sent to the CMTS MAC equipment through the CMTS PHY equipment. Time Division Multiple Access (TDMA) is used between the CMTS MAC device and the CMTS PHY device.
Fig. 2 is a schematic diagram of a network structure according to an embodiment of the present invention. In this network architecture, the MAC portion and PHY portion of the CMTS are also separated at different locations, referred to as Remote media access control layer processing Device (RMD) and Remote physical layer processing Device (RPD), respectively, in this and other embodiments. Since the MAC and PHY layer processes can be separated and processed separately on one device, the present embodiment further separates the basic communication unit responsible for signal reception and transmission in this device that performs the MAC layer process or the device that performs the PHY layer process. The RMD and RPD in this embodiment are different from the CMTS MAC device and the CMTS PHY device in the network structure shown in fig. 1, both the RMD and RPD in this embodiment have pluggable or replaceable active structures of their internal communication interfaces, and by inserting communication interface modules supporting the same protocol into the RMD and RPD, the two devices transmit signals on corresponding transmission media. In this way, the RMD is still located in the central office, but is connected to the RPD devices at the remote end through optical fibers, network cables, or wireless signals, and the RPDs are connected to the CM through coaxial cables, respectively.
In this embodiment, as shown in fig. 3, the RMD includes a signal processing unit and a signal interface unit, where the signal interface unit and the signal processing unit are two independent parts, and are connected through a movable interface, and the movable interface is a contact-type pluggable interface;
the signal processing unit is used for analyzing and scheduling the MAC layer of the received signal.
The signal processing unit specifically comprises an uplink interface, an analog-to-digital/digital-to-analog (AD/DA) converter and an MAC message processing chip; the uplink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device, and may be a UEPI or DEPI interface, for example; the AD/DA converter is used for converting signals from analog to digital or from digital to analog; the MAC message processing chip is used for analyzing and scheduling the MAC data message and the MAC control message.
The analysis and scheduling of the MAC layer are the MAC layer message processing specified by the data over Cable service interface Specification protocol DOCSIS 3.0 or DOCSIS 3.1 protocol.
The signal interface unit is used for sending the signals processed by the signal processing unit to lower-layer equipment or sending the signals received from the lower-layer equipment to the signal processing unit for processing.
The signal interface unit specifically includes a protocol adapter and a communication interface, where the communication interface is used to receive or send a signal, such as a UEPI interface, a DEPI interface, an ethernet interface, or a Common Public Radio Interface (CPRI), and the protocol adapter is matched with a transmission protocol supported by the communication interface, and is used to process a signal received from the signal processing unit and adapt the signal to a signal that can be sent by the communication interface; and the signal received by the communication interface from the lower layer equipment is sent to the signal processing unit after being adapted and processed. The UEPI interface, the DEPI interface and the CPRI interface correspond to a UEPI signal receiver and transmitter, a DEPI signal receiver and transmitter, and a CPRI signal receiver, transmitter and antenna.
In this embodiment, as shown in fig. 4, the RPD includes a signal processing unit and a signal interface unit, where the signal interface unit and the signal processing unit are two independent parts, and are connected through a movable interface, and the movable interface is a contact-type pluggable interface;
the signal interface unit is used for sending the signal processed by the signal processing unit to upper-layer equipment or sending the signal received from the upper-layer equipment to the signal processing unit for processing.
The signal interface unit specifically includes a protocol adapter and a communication interface, the communication interface is used for receiving or sending signals, such as a UEPI interface, a DEPI interface, an ethernet interface, or a common public radio interface CPRI, and the protocol adapter is matched with a transmission protocol supported by the communication interface, and is used for processing the signals received from the signal processing unit and adapting the signals to be sent by the communication interface; and the signal received by the communication interface from the upper layer equipment is sent to the signal processing unit after being adapted and processed.
The signal processing unit is used for carrying out modulation and demodulation processing of a PHY layer on the received signal.
The signal processing unit specifically comprises a downlink interface, an analog-to-digital/digital-to-analog (AD/DA) converter and a PHY message processing chip; the uplink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device, and may be a UEPI or DEPI interface, for example; the AD/DA converter is used for converting signals from analog to digital or from digital to analog; the PHY message processing chip is used for carrying out modulation and demodulation processing of a PHY layer on the message.
The modulation and demodulation processing of the PHY layer is the modulation and demodulation processing of the PHY layer specified by a data over Cable service interface Specification protocol DOCSIS 3.0 or a DOCSIS 3.1 protocol.
After the RMD and the RPD are inserted into the signal interface units supporting the same protocol, the RMD and the RPD can be connected by using corresponding transmission media; for example, after the RMD and the RPD are inserted into a signal interface unit supporting UEPI or DEPI interfaces, the RMD and the RPD can be connected by a coaxial cable for signal transmission; after the RMD and the RPD are inserted into the signal interface unit supporting the Ethernet interface, the RMD and the RPD can be connected by optical fibers for signal transmission; after the RMD and the RPD are inserted into the signal interface unit supporting CPRI, the wireless signal transmission can be carried out between the RMD and the RPD. This avoids the limitation of the prior art that a CMTS PHY or MAC device can only be deployed in a single scenario, where different scenarios require only pluggable components in the RMD and RPD to replace signal interface units for the transmission protocols corresponding to the transmission media, while other components in the RMD and RPD can be common.
It should be noted that the RMD and RPD are not understood to include only the components listed in fig. 3 and 4, and other signal processing devices, such as a power controller, a time synchronization device, and other signal processing auxiliary units, may be included in the RMD and RPD besides the components listed in fig. 3 and 4.
Taking the scenario in which the RMD and RPD are connected by an optical fiber as an example, in the downstream direction, as shown in fig. 5, a method embodiment of the present invention provides a signal processing method, including steps 501-504, wherein,
step 501, the RMD performs MAC layer processing on the received signal;
the MAC layer processing is MAC layer message processing specified by a DOCSIS 3.0 or DOCSIS 3.1 protocol;
step 502, the RMD sends the signal-to-layer optical signal processed by the MAC layer to the RPD through an optical fiber;
step 503, after receiving the optical signal, the RPD performs PHY layer processing;
the PHY layer processing is PHY layer message processing specified by a DOCSIS 3.0 or DOCSIS 3.1 protocol;
step 504, the RPD sends the processed signal to a downstream device; the downstream device is typically a CM.
In the uplink direction, as shown in fig. 6, another signal processing method is provided in one embodiment of the present invention, which includes steps 601-604, wherein,
step 601, the RPD performs PHY layer processing on the received signal;
the MAC layer processing is PHY layer message processing specified by a DOCSIS 3.0 or DOCSIS 3.1 protocol;
step 602, the RPD sends the optical signal of the signal conversion layer processed by the PHY layer to the RMD through an optical fiber;
step 603, after receiving the optical signal, the RMD performs MAC layer processing;
the MAC layer processing is MAC layer message processing specified by a DOCSIS 3.0 or DOCSIS 3.1 protocol;
step 604, the RMD sends the processed signal to an upstream device.
The uplink and downlink processing flow in the scenario where RMD and RPD are connected by wireless signals is similar to that of fig. 5 and 6, except that optical signals need to be replaced by wireless signals. The essence of supporting this conversion is to insert a signal interface unit supporting CPRI in both RMD and RPD.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The processing methods for realizing specific functions in the above device embodiments include, but are not limited to, the corresponding processing methods disclosed in the method embodiments;
additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that in the present embodiment, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An RMD device is characterized by comprising a signal processing unit and a signal interface unit, wherein the signal interface unit and the signal processing unit are two independent parts and are connected through a movable interface, and the movable interface is a contact pluggable interface;
the signal processing unit is used for analyzing and scheduling the MAC layer of the received signal;
the signal interface unit is used for sending the signals processed by the signal processing unit to lower-layer equipment or sending the signals received from the lower-layer equipment to the signal processing unit for processing;
the signal processing unit comprises an uplink interface, an analog-digital/digital-analog converter and an MAC message processing chip; wherein,
the uplink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device;
the analog-to-digital/digital-to-analog converter is used for converting a signal from analog to digital or from digital to analog;
the MAC message processing chip is used for analyzing and scheduling the MAC data message and the MAC control message;
the signal interface unit comprises a protocol adapter and a communication interface; wherein,
the communication interface is used for receiving or sending signals;
the protocol adapter is matched with a transmission protocol supported by the communication interface, and is used for processing the signals received from the signal processing unit, adapting the signals to be the signals which can be sent by the communication interface, and sending the signals received by the communication interface from lower-layer equipment to the signal processing unit after adapting processing.
2. The apparatus of claim 1 wherein the MAC layer parsing and scheduling is MAC layer message processing specified by the data over cable service interface specification protocol DOCSIS 3.0 or DOCSIS 3.1 protocol.
3. An RPD device is characterized by comprising a signal processing unit and a signal interface unit, wherein the signal interface unit and the signal processing unit are two independent parts and are connected through a movable interface, and the movable interface is a contact pluggable interface;
the signal interface unit is used for sending the signal processed by the signal processing unit to upper-layer equipment or sending the signal received from the upper-layer equipment to the signal processing unit for processing;
the signal processing unit is used for carrying out modulation and demodulation processing of a PHY layer on the received signal;
the signal interface unit comprises a protocol adapter and a communication interface; wherein,
the communication interface is used for receiving or sending signals;
the protocol adapter is matched with a transmission protocol supported by the communication interface, is used for processing the signal received from the signal processing unit and is adapted to the signal which can be sent by the communication interface; after the signal received by the communication interface from the upper layer equipment is subjected to adaptation processing, the signal is sent to the signal processing unit;
the signal processing unit comprises a downlink interface, an analog-digital/digital-analog converter and a PHY message processing chip; wherein,
the downlink interface is used for receiving signals from an upper layer device or sending signals to the upper layer device;
the analog-to-digital/digital-to-analog converter is used for converting a signal from analog to digital or from digital to analog;
the PHY message processing chip is used for carrying out modulation and demodulation processing on the message.
4. The apparatus of claim 3, wherein the modulation and demodulation process of the PHY layer is a PHY layer modulation and demodulation process specified by a data over Cable service interface Specification protocol DOCSIS 3.0 or DOCSIS 3.1 protocol.
5. A signal processing system, comprising: the RMD device of claim 1, and the RPD device of claim 3; the signal interface unit in the RMD and the signal interface unit in the RPD support the same interface protocol, and the RMD and the RPD are connected through a communication medium corresponding to the interface protocol.
Priority Applications (2)
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| PCT/CN2018/109600 WO2019128376A1 (en) | 2017-12-29 | 2018-10-10 | Signal processing apparatus and system |
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