CN108650561B

CN108650561B - System and method for managing code in 100G EPON

Info

Publication number: CN108650561B
Application number: CN201810333626.2A
Authority: CN
Inventors: 杨旭; 曹桦
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2018-04-13
Filing date: 2018-04-13
Publication date: 2020-10-09
Anticipated expiration: 2038-04-13
Also published as: CN108650561A

Abstract

The invention discloses a system and a method for managing code in 100G EPON, relating to the field of 100G EPON. The method comprises the following steps: the MAC LLID uniformly numbers the MAC, and the PON MAC is identified through the LLID; the MPRS determines the corresponding relation between a plurality of MAC layers and 4 physical coding sublayer PCS layers; the PCS based on the code encodes data according to the code; and the code selection module flexibly selects the code according to the distribution condition of the LLID. The invention adds a code selection module which knows whether the corresponding MAC speed is 25G, 50G or 100G according to the LLID distribution condition of the MAC, dynamically selects the code according to the 25G, 50G and 100G distribution condition in the MAC in the system, is effective to the uplink and downlink flow, can improve the forwarding efficiency and reduce the time delay.

Description

System and method for managing code in 100G EPON

Technical Field

The invention relates to the field of 100G EPON, in particular to a system and a method for managing code in 100G EPON.

Background

After a 10G-PON (Passive Optical Network ), there are 2 ways to increase the speed in the PON technology, one is to increase the single-wavelength speed, and the baud rate is increased from 10G to 25G and higher; the other is a multi-wave mode, the single wavelength rate is 10G or 25G, and 4 wavelengths can be superposed to 40G/100G. The technical standards of PON are classified into a Gigabit-capable Optical Network (GPON) system of ITU (International telecommunications Union) and an Ethernet Passive Optical Network (Ethernet Passive Optical Network) system of IEEE (Institute of electrical and Electronics Engineers, american society of electrical and Electronics Engineers), wherein the IEEE started to research NG-EPON (next generation Ethernet Passive Optical Network) in 2013, and a NG-EPON technical white paper was released in 2015 3. A100G-EPON standard is set in 7 months in 2015 and named as IEEE802.3ca, and the 100G-EPON standard is planned to be issued in 2018.

With the rise of 4K/8K ultra-high-definition videos, VR virtual reality, Internet of things and cloud computing, user bandwidth is continuously increased, for example, the 4K videos need 30-100M bandwidth. According to the OVUM survey, 60 operators worldwide initiate gigabroadband strategies, such as: the Chinese telecom proposes 'national 4K, hundred million popularization and giga leading', which is referred to as 'metropolitan area network/access network construction guide supporting hundred million and 4K video bearer', and OVUM is an authoritative neutral consultant company in the world telecom industry and is engaged in telecom and information technology business strategy research. China Mobile proposes that "50M occupies the market, 100M is dominant, and gigabit is the future", see "China Mobile Wired broadband Access network guiding comments (2016).

On the other hand, 5G mobile communication also puts higher requirements on bandwidth of mobile forward transmission and return transmission, 5G pppaydetection Working Group considers that 100G WDM PON (Wavelength Division multiplexing PON) is the main access scheme of 5G, and most of the participating operators consider that the 5G network will be supported by 100G WDM-PON in the european 2016NG-PON conference. In the aspect of development of 100G PON technical standards, an FSAN (full service Access Network ) agrees to establish 25G in 2016, 9 months, and the standard name is tentatively "power transmission technologies above 10G per wavelength", IEEE establishes Study Group (research Group) in 2015, performs technical analysis on single channel 25G rate, 2015, 9 months, the project number is p803.2ca, 2015, 11 months, establishes Task Force (work Group), and enters a standard drafting stage, so that the current IEEE works relatively fast.

The MAC (Medium Access Control) layer of 100G EPON defines 3 MAC layer rates: 25G, 50G and 100G. PCS (Physical coding Sublayer)/PMA (Physical Media Attachment)/PMD (Physical Media dependency interface) is 4 channels, 25G rate per channel, and RS (coordination Sublayer) of 100G EPON is relatively large in variation with respect to EPON/10G EPON, and is called MPRS (MultiPoint coordination Sublayer).

Referring to fig. 1, in the module division of the data link layer and the physical layer of the 100G EPON system, the physical layer of the 100G EPON is added with an MPRS sublayer relative to the EPON standard, and the upstream data stream (ONU to OLT) and the downstream data stream (OLT to ONU) are symmetric in MPRS.

Referring to fig. 2, an MPRS of a 100G EPON system is an architecture in which a data plane and a control plane are separated, and according to a control signal of the control plane: MPRS _ CTRL _ indication (multipoint coordination sublayer control indication) and MPRS _ CTRL _ request (multipoint coordination sublayer control application), where the MPRS sends and receives multiple MACs and PHYs (Physical Layer) of an interworking data plane, where the number of MACs is equal to the number of Logical Link Identifiers (LLIDs) of the system, and the uplink and downlink data flows of the system are the same. As can be seen from fig. 2, the MPRS coordinates data of multiple MAC layers to 4 25GMII (Gigabit media independent Interface) transceivers of the physical layer, thereby improving system efficiency.

The MPRS is connected with a plurality of MAC layer rates which can be 25G, 50G or 100G, and the physical layer PHY is divided into PCS, PMA and PMD, wherein, the PCS codes data according to the system code word, and one code word is a frame data which is subjected to code check and matches the rate between the RS layer and the PHY layer. For example: the MAC layer rate is 25G bandwidth and the physical layer is 100G bandwidth, and the idle codes need to be filled.

The following description will take uplink data as an example.

Fig. 3 is a schematic diagram of the MPRS and PHY connections of the current 100G EPON draft standard system, where the MAC layer of 100G EPON defines 3

MAC layer rates

25G, 50G and 100G, and the MPRS can be simplified to be virtually viewed as 3 RSs, 25G RSs, 50G RSs and 100GRS, but the PHY is 4 25G lanes, fixed 100G rate.

The PCS of 100G EPON needs to select proper codec to realize the rate matching of 3 RSs (25G RSs, 50G RSs and 100GRS) to 4 25G physical channels, the data of the RSs is random, and the codec selection must consider the forwarding efficiency and the time delay.

The current draft standard uses 2 Codeword adaptations 25G/50G/100G in various combinations, one for conveying data of 25G RS and 50G RS, wherein 25G RS occupies channel 1 of 4 25G channels, 50G

RS occupies channels

2 and 3 of 4 25G channels, and the other for conveying data of 100G RS. The data of the RS is taken out according to the polling algorithm, sorted and filled according to the code in sequence, and issued to the PMA/PMD, and as can be seen from the above, the code is selected to be solidified transceiving data, which cannot be flexibly adjusted according to the distribution conditions and the priority of the 25G RS, the 50G RS and the 100G RS of the system, so that the forwarding efficiency and the time delay cannot be optimized according to the conditions of the system.

Disclosure of Invention

The present invention aims to overcome the defects of the background art, and provides a system and a method for managing code in a 100GEPON, which can improve the forwarding efficiency and reduce the time delay.

The invention provides a system for managing code in 100G EPON, which comprises a medium access control MAC logical link identifier LLID, a multipoint coordination sublayer MPRS, a physical coding sublayer PCS based on code word code, and a code selection module, wherein:

the MAC LLID is used for: uniformly numbering the LLIDs on the MACs, and identifying the PON MACs through the LLIDs;

MPRS is used to: determining the corresponding relation between a plurality of MAC layers and 4 PCS layers;

the Codeword-based PCS is used to: coding data according to the code;

the code selection module is used for: and flexibly selecting the code according to the distribution condition of the LLID.

On the basis of the above technical solution, the LLID includes rate information of the MAC.

On the basis of the technical scheme, the code selection module learns whether the rate of the corresponding MAC is 25G, 50G or 100G through the LLID of the MAC, and dynamically selects the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system.

On the basis of the technical scheme, if the code selection module learns that: the system MAC rate is at least one of 25G, 50G and 100G, and the system only needs one code, selects a proper number of 25G channels and sequentially transmits RS data of a polling coordination sublayer.

On the basis of the technical scheme, if the code selection module learns that: the system MAC rate simultaneously comprises 100G MAC and other MAC rates, and code distribution is carried out according to the current draft scheme.

The invention also provides a method for managing code in 100G EPON based on the system, which comprises the following steps:

the media access control MAC logic link identification LLID uniformly numbers the LLID to the MAC, and the PONMAC is identified through the LLID;

the MPRS determines the corresponding relation between a plurality of MAC layers and 4 PCS layers;

the PCS based on the code word encodes data according to the code word;

and the code selection module flexibly selects the code according to the distribution condition of the LLID.

On the basis of the technical scheme, the code selecting module flexibly selects the code according to the distribution condition of the LLID, and the method specifically comprises the following steps:

the code selecting module learns whether the rate of the corresponding MAC is 25G, 50G or 100G through the LLID of the MAC, and dynamically selects the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system.

On the basis of the above technical solution, the dynamically selecting the code of the system according to the distribution of 25G, 50G and 100G in the MAC in the system specifically includes the following steps:

if the code selection module knows through LLID: the system MAC rate is at least one of 25G, 50G and 100G, and the system only needs one code, selects a proper number of 25G channels and sequentially transmits RS data of a polling coordination sublayer.

if the code selection module knows through LLID: the system MAC rate simultaneously comprises 100G MAC and other MAC rates, and code distribution is carried out according to the current draft scheme.

Compared with the prior art, the invention has the following advantages:

in the invention, the MAC LLID uniformly numbers the MAC, and the PON MAC is identified through the LLID; the MPRS determines the corresponding relation between a plurality of MAC layers and 4 physical coding sublayer PCS layers; and the PCS based on the code encodes data according to the code. The invention adds a code selection module which can know whether the rate of the corresponding MAC is 25G, 50G or 100G according to the LLID distribution condition of the MAC, thereby knowing the distribution conditions of 25G, 50G and 100G in the MAC in the system.

Drawings

Fig. 1 is a system block diagram of a 100G EPON.

Fig. 2 is an interface block diagram of a MPRS of a 100G EPON system.

Fig. 3 is a schematic diagram of MPRS and PHY connections in a 100G EPON system in the current draft standard.

Fig. 4 is a schematic diagram of connection between an MPRS and a PHY in a 100G EPON system according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Example 1

Referring to fig. 4, embodiment 1 of the present invention provides a system for managing a code in a 100G EPON, where the system includes a MAC LLID, an MPRS, a PCS based on the code, and a code selection module, where:

the Codeword-based PCS is used to: coding data according to the code;

the code selection module is used for: and flexibly selecting the system code according to the distribution condition of the system LLID.

Example 2

Referring to fig. 4, embodiment 2 of the present invention provides a system for managing a code in a 100G EPON, where the system includes a MAC LLID, an MPRS, a PCS based on the code, and a code selection module, where:

the MAC LLID is used for: uniformly numbering the LLIDs on the MACs, and identifying the PON MACs through the LLIDs; the LLID contains the rate information of the MAC;

the Codeword-based PCS is used to: coding data according to the code;

Example 3

Referring to fig. 4, embodiment 3 of the present invention provides a system for managing a code in a 100G EPON, where the system includes a MAC LLID, an MPRS, a PCS based on the code, and a code selection module, where:

the Codeword-based PCS is used to: coding data according to the code;

The code selecting module knows whether the rate of the corresponding MAC is 25G, 50G or 100G through the LLID of the MAC, and dynamically selects the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system.

Example 4

Referring to fig. 4, embodiment 4 of the present invention provides a system for managing a code in a 100G EPON, where the system includes a MAC LLID, an MPRS, a PCS based on the code, and a code selection module, where:

the Codeword-based PCS is used to: coding data according to the code;

The Cotword selection module, if informed by LLID: the system MAC rate is at least one of 25G, 50G and 100G, and the system only needs one code, selects a proper number of 25G channels and sequentially transmits RS data of a polling coordination sublayer.

Because LLID numbering is carried out on MAC uniformly, relevant information of MAC can be known through LLID, LLID contains rate information of MAC, and a code selection module can know whether the rate of the corresponding MAC is 25G, 50G or 100G through LLID of MAC, thereby knowing the distribution conditions of 25G, 50G and 100G in MAC in the system, and dynamically selecting the code of the system, the method is concretely realized as follows:

the Cotword selection module, if informed by LLID: the rate of the system MAC is only one of 25G, 50G and 100G, and only one code is needed in the system.

Taking 50G as an example, any two of 4 channels of 25G can be selected, and the polling RS data is issued in sequence, so that delay caused by two types of code polling is not generated.

The Cotword selection module, if informed by LLID: the MAC rate of the system is only 25G and 50G, at the moment, the system only needs one code, any three of 4 25G channels can be selected, the polling RS data is sequentially issued, and the time delay caused by polling of two codes is avoided.

The Cotword selection module, if informed by LLID: the rate of the system MAC is 100G MAC and MAC with other rate, and then the code distribution can be carried out according to the current draft scheme.

Example 5

On the basis of embodiment 1, embodiment 5 of the present invention provides a method for managing code in a 100G EPON, including the following steps:

the MAC LLID uniformly numbers the MAC, and the PON MAC is identified through the LLID;

the MPRS determines the corresponding relation between a plurality of MAC layers and 4 physical coding sublayer PCS layers;

the PCS based on the code encodes data according to the code;

Example 6

On the basis of embodiment 1, embodiment 6 of the present invention provides a method for managing code in a 100G EPON, including the following steps:

the MAC LLID uniformly numbers the MAC, and the PON MAC is identified through the LLID; the LLID contains the rate information of the MAC;

the PCS based on the code encodes data according to the code;

Example 7

On the basis of embodiment 1, embodiment 7 of the present invention provides a method for managing code in a 100G EPON, including the following steps:

the PCS based on the code encodes data according to the code;

the code selecting module flexibly selects the code according to the distribution condition of the LLID, and specifically comprises the following steps:

Example 8

On the basis of embodiment 1, embodiment 8 of the present invention provides a method for managing code in a 100G EPON, including the following steps:

the PCS based on the code encodes data according to the code;

the code selection module learns whether the rate of the corresponding MAC is 25G, 50G or 100G through the LLID of the MAC, and dynamically selects the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system:

The method and the device for selecting the Cotwork have the advantages that the Cotwork selection module is added, the Cotwork selection module can know whether the rate of the corresponding MAC is 25G, 50G or 100G according to the LLID distribution condition of the MAC, so that the distribution conditions of 25G, 50G and 100G in the MAC in the system can be known, the Cotwork can be dynamically selected according to the distribution conditions, the uplink and downlink flows are effective, the forwarding efficiency of the system can be improved, and the time delay is reduced.

Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.

What is not described in detail in the specification is prior art that is well known to those skilled in the art.

Claims

1. A system for managing code in 100G EPON is characterized by comprising a medium access control MAC logical link identifier LLID, a multipoint coordination sublayer MPRS, a physical coding sublayer PCS based on code word code and a code selection module, wherein:

the Codeword-based PCS is used to: coding data according to the code;

the code selection module is used for: flexibly selecting the coded according to the distribution condition of the LLID;

the LLID contains the rate information of the MAC;

the code selection module learns whether the rate of the corresponding MAC is 25G, 50G or 100G through the LLID of the MAC, and dynamically selects the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system;

if the code selection module knows through LLID: the system MAC rate is at least one of 25G, 50G and 100G, the system only needs one code, selects a proper number of 25G channels, and polls the coordination sublayer RS data to issue in sequence;

if the code selection module knows through LLID: the system MAC rate simultaneously comprises 100G MAC and other MAC rates, and the code distribution is carried out according to the current draft scheme;

the code distribution according to the current draft scheme comprises the following steps:

for the 100G MAC, data of RS are taken out according to a polling algorithm, sorted and filled according to code in sequence, and issued to PMA/PMD;

and for the MAC of the other rate, the MAC is distributed according to the bandwidth of the channel.

2. A method for code management in a 100G EPON based on the system of claim 1, comprising the steps of:

medium access control MAC logical link identification LLID uniformly carries out LLID numbering on the MAC, and PON MAC is identified through LLID;

the PCS based on the code word encodes data according to the code word;

the code selection module flexibly selects the code according to the distribution condition of the LLID;

the LLID contains the rate information of the MAC;

the dynamically selecting the code of the system according to the distribution conditions of 25G, 50G and 100G in the MAC in the system specifically comprises the following steps: