WO2014121600A1

WO2014121600A1 - Downlink message transmitting method in photo-electric mixed system and optical coaxial unit

Info

Publication number: WO2014121600A1
Application number: PCT/CN2013/082655
Authority: WO
Inventors: 臧美燕; 李明生; 袁立权; 印永嘉
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-02-05
Filing date: 2013-08-30
Publication date: 2014-08-14
Also published as: CN103974151A; CN103974151B

Abstract

A downlink message transmitting method in photo-electric mixed system and an optical coaxial unit, include that: the Optical Coaxial Unit (OCU) connects with multiple Coaxial Distributed Networks (CDN), and establishes the mapping relation information of a Coaxial Network Unit (CNU) and an OCU port, wherein the OCU port is the port at which the CDN that the CNU belongs to connects to the OCU; upon receiving a message transmitted from an Optical Line Terminal (OLT) to the destination CNU, the OCU transmits the message to the CDN that the destination CNU belongs to via the OCU port corresponding to the destination CNU according to the established mapping relation information of the CNU and the OCU port. In the present invention, after receiving the message from the OLT, the OCU inquires the mapping relation information of LLID and RFID of RF ports, transmits the message to the corresponding CNU via the corresponding CDN, and discards the message of all CDNs that do not belong to the OCU connection; thus unnecessary duplication process is avoided and high-efficiency forwarding of downlink message is accomplished.

Description

Method for transmitting downlink message in optical hybrid system and optical coaxial unit

Technical field

The invention relates to a photoelectric hybrid system of a passive optical network + a coaxial broadband network, in particular to a transmission method and an optical coaxial unit of a downlink in a photoelectric hybrid system.

Background technique

A fundamental trend in the development of next-generation networks is the IP-enabled full-service network. For Cable (Cable) operators, such as Radio and Television, in order to make full use of its existing large number of Cable subscribers, Passive Optical Network (PON) and Ethernet over Cable (EOC) are proposed. Hybrid networking network transformation solution, PON and EOC hybrid networking is usually expressed as "PON+EOC".

As shown in FIG. 1 , in a typical PON+EOC networking mode, the PON includes: a PON, an EOC, and a background management system, where the PON includes an OLT (Optical Line Terminal) and an ODN (Optical Distributed Network). Optical distribution network) and optical layer part in OCU (Optical Coax Unit). The EOC includes the electrical layer portion of the OCU and the CNU (Coaxial Network Unit). The OCU may be an integrated device as shown in FIG. 1 or may be composed of two devices, namely an optical network unit (ONU) of the OCU and a coaxial electrical component device of the OCU (Coaxial Line). Terminal, CLT). The OCU is the headend device in the EOC scheme, and the CNU is the terminal device in the EOC scheme.

Currently, there is an implementation scheme of EOC, namely EPoC (EPoN Over Coax, EPON MAC-based coaxial access technology and scheme). As shown in Figure 2, the networking diagram of PON+EPoC is a specific form of PON+EOC networking. In the entire system architecture shown in the networking diagram, the optical layer part includes OLT+ODN+ EPoC. The optical layer module of the OCU, the electrical layer part contains the EPOC OCU's electrical layer module + CDN (Coaxial Distributed Unit) + CNIL. In this architecture, the user side of the CNU and OCU is the Coax-based physical layer, but the MAC reuses the EPON MAC. .

Currently, when an optical port in the OCU corresponds to multiple RF (radio) ports, how to send the downlink packets sent from the OLT to the OCU through the correct RF port to the CNU in the corresponding CDN during the downlink forwarding process. Not occupying the bandwidth of other CDNs is an urgent problem to be solved. Summary of the invention

The technical problem to be solved by the present invention is to provide a method for transmitting a downlink message and an optical coaxial unit in an opto-electric hybrid system, which can implement downlink message transmission when an OCU is connected to multiple CDNs.

In order to solve the above technical problem, a method for transmitting a downlink packet in an opto-electric hybrid system of the present invention includes:

The optical coaxial unit OCU is connected to a plurality of coaxial distribution networks CDN, and the mapping relationship between the coaxial network unit CNU and the OCU port is established, and the OCU port is a port of the OCU to which the CDN to which the CNU belongs is connected;

When receiving the packet sent by the optical line terminal OLT to the destination CNU, the OCU sends the packet to the destination CNU through the OCU port corresponding to the destination CNU according to the mapping relationship between the CNU and the OCU port. CDN.

Preferably, the mapping relationship between the CNU and the OCU port is mapping relationship between the logical link identifier LLID of the CNU and the identifier of the radio frequency RF port of the OCU, where the RF port of the OCU is the CDN connection to which the CNU belongs. The OCU's RF port.

Preferably, the sending, by the OCU port corresponding to the destination CNU, the packet to the CDN to which the destination CNU belongs according to the mapping relationship between the CNU and the OCU port, including:

The OCU queries the mapping relationship between the LLID of the destination CNU and the identifier of the RF port of the OCU according to the LLID carried in the packet sent to the destination CNU, and obtains the identifier of the corresponding RF port, which is obtained according to the query. The identifier of the RF port is sent to the CDN to which the destination CNU belongs through the corresponding RF port.

Preferably, the mapping relationship information between the CNU and the OCU port is mapping relationship information between the LLID of the CNU and the identifier of the passive optical network media access control PON MAC in the OCU, where the PON MAC is the CNU The PON MAC corresponding to the RF port to which the CDN is connected.

The OCU queries the LLID carried in the packet sent to the destination CNU. The mapping relationship between the LLID of the destination CNU and the identifier of the PON MAC in the OCU is used to learn the PON MAC identifier corresponding to the destination CNU, and the packet is sent to the CDN to which the destination CNU belongs by using the PON MAC corresponding to the destination CNU. .

An optical coaxial unit includes: a light receiving and transmitting module, a passive optical network medium access control PON MAC, and a control module, wherein the control module is connected to the PON MAC, and the PON MAC is also connected to multiple coaxial distribution networks. CDN is connected, where:

The control module is configured to: establish mapping relationship information between the coaxial network unit CNU and the optical coaxial unit OCU port, where the OCU port is a port of the OCU to which the CDN to which the CNU belongs; the optical receiving and sending module, setting The method is: receiving a packet sent by the optical line terminal OLT to the destination CNU, and sending the received packet to the PON MAC;

The PON MAC is configured to: when receiving the packet sent by the optical receiving and transmitting module, send the packet to the destination by using an OCU port corresponding to the destination CNU according to the mapping relationship between the CNU and the OCU port. The CDN to which the CNU belongs.

Preferably, the OCU port is a radio frequency RF port;

The mapping relationship between the CNU and the OCU port is the mapping relationship between the logical link identifier LLID of the CNU and the identifier of the radio frequency RF port of the OCU, and the RF port of the OCU is the OCU of the CDN to which the CNU belongs. RF port.

Preferably, the PON MAC is set to: query the mapping relationship between the LLID of the destination CNU and the identifier of the RF port of the OCU according to the LLID carried in the packet sent to the destination CNU, to obtain a corresponding RF port. The identifier is sent to the CDN to which the destination CNU belongs by using the corresponding RF port according to the identifier of the RF port obtained by the query.

Preferably, the PON MAC is multiple, the OCU port is an RF port, each PON MAC is connected to one RF port, and each RF port is connected to one CDN;

The mapping relationship between the CNU and the OCU port is the LLID and the PON of the CNU.

The mapping relationship information of the identifier of the MAC, where the PON MAC is a PON MAC corresponding to an RF port to which the CDN to which the CNU belongs.

Preferably, the PON MAC is set as: according to the message sent to the destination CNU The carried LLID is used to query the mapping relationship between the LLID of the destination CNU and the identifier of the PON MAC. When the LLID carried in the packet corresponds to its own identifier, the packet is sent to the CDN to which the destination CNU belongs.

In summary, in the embodiment of the present invention, when one optical receiving and transmitting module in the OCU corresponds to multiple RF ports, the mapping relationship between the LLID identifying the CNU and the RFID identifying the RF port is established on the OCU. Filtering and forwarding of downlink packets. In this way, after the OCU receives the information from the OLT, the OCU sends the packet to the corresponding CNU through the corresponding CDN by querying the mapping relationship between the established LLID and the RF interface of the RF port. The packets of all the CDNs connected to the OCU avoid unnecessary replication and complete efficient forwarding of downlink packets. BRIEF abstract

1 is an architectural diagram of a typical PON+EOC system in the related art;

2 is a structural diagram of PON+EPoC in the related art;

3 is a flowchart of a method for transmitting a downlink packet when a PON MAC corresponds to multiple RF ports according to an embodiment of the present disclosure;

4 is a flowchart of a method for transmitting a downlink PON of a PON MAC and an RF port according to an embodiment of the present invention;

FIG. 5 is a structural diagram of an optical coaxial unit according to an embodiment of the present invention; FIG.

FIG. 6 is a structural diagram of another optical coaxial unit according to an embodiment of the present invention.

Preferred embodiment of the invention

In the PON+EOC, especially the EPoC opto-hybrid system, when one optical port of the OCU corresponds to multiple RF ports, that is, one OCU device connects multiple CDNs, multiple passive optical networks on the OCU are used. The media access control (PON MAC) and the multiple RF ports correspond to each other; or one PON MAC on the OCU corresponds to multiple RF ports, and the mapping relationship between the CNU and the OCU port is established on the OCU. The downlink packet is filtered by the mapping relationship information, so that the corresponding downlink packet can reach the corresponding CNU through the corresponding RF port, that is, the CDN. The efficient forwarding of downlink packets is completed.

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

Example 1 :

As shown in FIG. 3, the OCU includes an optical receiving and transmitting module, a PON MAC, and corresponding to a plurality of RF ports, and the CDN connected to each RF port is connected to the CNU, and the downlink packet is sent in the opto-electric hybrid system of the present embodiment. Methods, including:

301: CNU1 (destination CNU) is powered on to complete the initialization process, and the OCU control module establishes mapping relationship information between the LLID of the CUN1 and the identifier of the corresponding RF port in the PON MAC through the initialization process of the CNU1;

During initialization, the OLT assigns a unique LLID to CNU1. Since OCU1 is an intermediate device between the OLT and CNU1, OCU1 will obtain the LLID (LLID1) of CNU1.

At the same time, the relevant MPCP protocol in the CNU1 initialization process reaches the OCU1 through a specific RF port. Therefore, the OCU1 can know the RF port corresponding to the CNU1 through the internal hardware identifier, and then know the RFID port identifier RFID1 corresponding to the LLID1.

The OCU1 establishes the mapping relationship between the LLID and the identifier of the RF port by using the acquired LLID of the CNU1 and the identifier of the RF port through which the CNU1 text interacts, that is, the LLID 1 corresponds to the RFID 1.

302: The OLT sends a downlink packet, where the downlink message preamble carries LLID1;

303: The downlink packet sent by the OLT is first received by the optical receiving and transmitting module of the OCU1, and then processed by the PON MAC of the OCU1, and the mapping relationship between the LLID and the RFID established by the PON MAC search control module is found, and the LLID 1 corresponding to the RFID 1 is found;

304: OCU1 sends the packet corresponding to LLID1 to the corresponding CNU1 through RF1.

Complete the filtering and forwarding process of the entire downlink packet.

Example 2:

As shown in FIG. 4, the OCU includes an optical receiving and transmitting module, a plurality of PON MACs, and The plurality of RF ports, the PON MAC and the RF port, corresponding to the CDN connected to each of the RF ports, are connected to the CNU, and the method for transmitting the downlink information in the opto-electric hybrid system of the present embodiment includes:

401: The initialization process of the CNU1 is completed, and the control module of the OCU establishes mapping relationship information between the identifier of the PON MAC1 and the identifier of the RF port in the PON MAC1 through the initialization process of the CNU1;

Since each PON MAC and RF port correspond to each other, the hardware can ensure that the downlink packet entering the PON MAC can only be forwarded through the RF port corresponding to the PON MAC, or the uplink from the RF port is only It can be processed via the PON MAC corresponding to the RF port, so it is only necessary to perform packet filtering by the LLID of the CNU. LLID1 will only be obtained by PON MAC1.

402: The OLT sends a downlink packet, where the downlink packet preamble carries LLID1;

403: The downlink packet sent by the OLT is first received by the optical receiving and transmitting module of the OCU1, and then the PON MAC1 performs filtering according to the mapping relationship between the LLID1 and the PON MAC1 identifier established by the control module, and the PON MAC1 determines that the downlink packet belongs to the self-received When the downlink packet is received, the downlink packet is forwarded to CDN1 through the connected RF1 port.

Since PON MAC1 and RFID1 are in hardware-corresponding, the downlink message is forwarded to CDN1 via RF1. The OCU1 sends the downlink message corresponding to the LLID1 to the corresponding CNU1 through the RF1 to complete the filtering and forwarding process of the entire downlink packet.

An optical coaxial unit of the embodiment includes: a light receiving and transmitting module, a passive optical network medium access control PON MAC, and a control module, wherein the control module is connected to the PON MAC, and the PON MAC is also connected to the plurality of coaxial distribution networks CDN. , among them:

a control module, configured to establish a mapping relationship between the coaxial network unit CNU and the OCU port of the optical coaxial unit, where the OCU port is a port of the OCU to which the CDN to which the CNU belongs is connected;

The optical receiving and transmitting module is configured to receive a packet sent by the optical line terminal OLT to the destination CNU, and send the received packet to the PON MAC; The PON MAC is configured to send the packet to the CDN to which the destination CNU belongs by using the OCU port corresponding to the destination CNU according to the mapping relationship between the CNU and the OCU port when receiving the packet sent by the optical receiving and transmitting module.

As shown in FIG. 5, the OCU port is a radio frequency RF port; the mapping relationship between the CNU and the OCU port is the mapping relationship between the logical link identifier LLID of the CNU and the identifier of the radio frequency RF port of the OCU, and the RF port of the OCU belongs to the CNU. The RF port of the OCU to which the CDN is connected.

The PON MAC is used to query the mapping relationship between the LLID of the destination CNU and the identifier of the RF port of the OCU according to the LLID carried in the packet sent to the destination CNU, and obtain the identifier of the corresponding RF port. The identifier of the RF port is sent to the CDN to which the destination CNU belongs through the corresponding RF port.

As shown in FIG. 6, the PON MAC is multiple, the OCU port is an RF port, each PON MAC is connected to one RF port, and each RF port is connected to one CDN; the mapping relationship between the CNU and the OCU port is CNU LLID and PON. The mapping relationship information of the identity of the MAC, and the PON MAC is a PON MAC corresponding to the RF port to which the CDN to which the CNU belongs.

The PON MAC is used to query the mapping relationship between the LLID of the destination CNU and the identifier of the PON MAC according to the LLID carried in the packet sent to the destination CNU. When the LLID carried in the packet corresponds to its own identifier, The message is sent to the CDN to which the destination CNU belongs.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

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

In the embodiment of the present invention, when an optical receiving and transmitting module in the OCU corresponds to multiple RF ports, the mapping between the LLID of the CNU and the RFID of the identified RF port is established on the OCU to complete filtering of the downlink packet. Forward. In this way, after receiving the packet from the OLT, the OCU queries the established LLID and the RFID mapping relationship information of the RF port, so that the packet is sent to the corresponding CNU through the corresponding CDN, and the discard does not belong to the packet. The packets of all the CDNs connected to the OCU avoid unnecessary replication and complete the efficient forwarding of the downlink packets.

Claims

claims

1. A method for sending downlink text in a photoelectric hybrid system, including:

The optical coaxial unit OCU is connected to multiple coaxial distribution networks CDN, and establishes mapping relationship information between the coaxial network unit CNU and the OCU port. The OCU port is the port of the OCU to which the CDN to which the CNU belongs is connected;

When the OCU receives the message sent by the optical line terminal OLT to the destination CNU, according to the established mapping relationship information between the CNU and the OCU port, the message is sent to the destination CNU through the OCU port corresponding to the destination CNU. CDN.

2. The method of claim 1, wherein the mapping relationship information between the CNU and the OCU port is the mapping relationship information between the logical link tag LLID of the CNU and the identification of the radio frequency RF port of the OCU. The RF port is the RF port of the OCU connected to the CDN to which the CNU belongs.

3. The method of claim 2, wherein, according to the established mapping relationship information between the CNU and the OCU port, the message is sent to the CDN to which the destination CNU belongs through the OCU port corresponding to the destination CNU, including:

The OCU queries the mapping relationship information between the LLID of the destination CNU and the identifier of the RF port of the OCU according to the LLID carried in the message sent to the destination CNU, and obtains the identifier of the corresponding RF port. According to the query, The identification of the RF port, and the message is sent to the CDN to which the destination CNU belongs through the corresponding RF port.

4. The method of claim 1, wherein the mapping relationship information between the CNU and OCU ports is the mapping relationship information between the LLID of the CNU and the identification of the Passive Optical Network Media Access Control PON MAC in the OCU, so The PON MAC is the PON MAC corresponding to the RF port connected to the CDN to which the CNTJ belongs.

5. The method of claim 4, wherein, according to the established mapping relationship information between the CNU and OCU ports, the message is sent to the CDN to which the destination CNU belongs through the OCU port corresponding to the destination CNU, including:

The OCU queries the mapping relationship information between the LLID of the destination CNU and the identifier of the PON MAC in the OCU based on the LLID carried in the message sent to the destination CNU, and obtains the information. The identifier of the PON MAC corresponding to the destination CNU is specified, and the message is sent to the CDN to which the destination CNU belongs through the PON MAC corresponding to the destination CNU.

6. An optical coaxial unit, including: an optical receiving and transmitting module, a passive optical network media access control PON MAC and a control module. The control module is connected to the PON MAC, and the PON MAC is also connected to multiple coaxial The distribution network is connected to CDN, where:

The control module is configured to: establish mapping relationship information between the coaxial network unit CNU and the optical coaxial unit OCU port, where the OCU port is the port of the OCU to which the CDN to which the CNU belongs is connected; the optical receiving and transmitting module is configured To: receive the message sent by the optical line terminal OLT to the destination CNU, and send the received message to the PON MAC;

The PON MAC is set to: when receiving a message sent by the optical receiving and sending module, according to the mapping relationship information between the CNU and the OCU port, the message is sent to the destination through the OCU port corresponding to the destination CNU. CDN to which CNU belongs.

7. The optical coaxial unit as claimed in claim 6, wherein,

The OCU port is a radio frequency RF port;

The mapping relationship information between the CNU and the OCU port is the mapping relationship information between the logical link tag LLID of the CNU and the identification of the radio frequency RF port of the OCU. The RF port of the OCU is the OCU connected to the CDN to which the CNU belongs. RF port.

8. The optical coaxial unit as claimed in claim 7, wherein,

The PON MAC is set to: According to the message carried in the message sent to the destination CNU

LLID, query the mapping relationship information between the LLID of the destination CNU and the identity of the RF port of the OCU, obtain the identity of the corresponding RF port, and then send the document through the corresponding RF port based on the identity of the RF port obtained by the query. Give the CDN to which the destination CNU belongs.

9. The optical coaxial unit as claimed in claim 6, wherein,

There are multiple PON MACs, the OCU port is an RF port, each PON MAC is connected to one RF port, and each RF port is connected to a CDN;

The mapping relationship information between the CNU and the OCU port is the mapping relationship information between the LLID of the CNU and the identification of the PON MAC, and the PON MAC is the CDN to which the CNU belongs. The PON MAC corresponding to the connected RF port.

10. The optical coaxial unit as claimed in claim 9, wherein,

The PON MAC is set to: query the mapping relationship information between the LLID of the destination CNU and the identifier of the PON MAC according to the LLID carried in the message sent to the destination CNU, and the LLID carried in the message and its own When the identifiers match, the message is sent to the CDN to which the destination CNU belongs.