CN103905932A - Service interoperability Ethernet passive optical network system based on NC and QoS perception - Google Patents
Service interoperability Ethernet passive optical network system based on NC and QoS perception Download PDFInfo
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Abstract
The invention discloses a service interoperability Ethernet passive optical network system based on the NC and QoS perception. According to the system, the localizing trend and diversity characteristics of a service are considered simultaneously, starting with the aspects of the improvements of the energy-saving efficiency of networks and the network performance, a novel data path structure of an ESP in the SIEPON is adopted, the broadcasting characteristic of a power divider is used, and therefore the capacity of information transfer energy efficiency is effectively improved; a classification function module [C], an queuing function module [Q], a scheduling function module [S] and the like are configured in the ESP in the SIEPON, so that the capacity in the aspects such as the data transfer performance and the multi-level service quality support of the networks are effectively improved.
Description
Technical field
The present invention relates to a kind of coding techniques (NC Network Based, Network Coding) and there is service quality (QoS, Quality of Service) the service-interworking Ethernet passive optical network (SIEPON of perception, Service Interoperability Ethernet Passive Optical Network) logical architecture, especially, different demands for business localization trend and multiple-operation grade are carried out corresponding logical network architecture design, belong to Optical Access Network network technical field.
Background technology
Current, along with appearance and the fast development of the new business such as HD video phone, end-to-end (P2P, Peer-to-Peer) network file are shared, 3D interactive game, the business localization trend of broadband access network is more and more obvious.NC technology is carried out the transmitting time of packet in this coding nodes of the incompatible shortening of code set to its different information flows of flowing through by coding nodes.If the source and destination node of broadband access network business is internal nodes of network, while being business localization, the advantage that NC technology is applied in broadband access network will be more and more obvious, it by promoting network throughput, the aspect such as energy resource consumption that reduces resource consumption and effectively reduce network plays an important role.
The advantages such as meanwhile, Ethernet passive optical network (EPON) is high with its standardization level, maintenance is simple, cost of access is low have become the important technology that realizes of broadband access.Ieee standard association (IEEE – SA) announces, is completed from technical standpoint by the IEEE P1904.1 SIEPON draft standard of 28 companies and laboratory participation.Transmit QoS demand for meeting diversified data in access network, SIEPON is aspect QoS guarantee, an EPON service routing (ESP has flexibly been proposed, EPON Service Path) optical line terminal (OLT of new ideas and data sequence scheduling, Optical Line Terminal) and optical network unit (ONU, Optical Network Unit) new architecture.ESP is controlling the arrangement scheduling, priority of Frame, allocated bandwidth and the delay etc. relevant to qos parameter.In addition, SIEPON has also stipulated the relevant parameter of configuration network service traffics, as key message speed (CIR, Committed Information Rate), crucial burst sizes (CBS, Committed Burst Size), extraneous information speed (EIR, Excess Information Rate), extra burst sizes (EBS, Excess Burst Size) etc., for QoS provides assurance.
Therefore, for access network business localization trend and the demand to many grades business support ability, realize a kind of novel SIEPON logical network framework based on NC and QoS perception, can effectively promote the ability of network aspect data transfer performance and the support of many grade services quality.
At present, based on the network design of SIEPON, mainly there is following shortcoming:
1) having ignored the impact of business localization trend on parameter, only there is the mutual of information between OLT and ONU in traditional E PON system, can not be applicable to the business transmission demand of current broadband access network, between ONU and ONU, also will carry out the mutual of information;
2), according to the different information interaction modes of OLT in EPON and ONU, ESP can have clean culture or two kinds of different forms of multicast.The multicast feature that although multicast ESP has NC technology while realizing, the packet replication that descending multicast need to be sent due to multicast ESP is in multiple subqueues, and identical packets need repeats transmission repeatedly, therefore has certain energy resource consumption;
3) in SIEPON, do not consider that the data transfer performance of network and the QoS of different brackets business guarantee simultaneously.
Given this, how in novel business-driven process, the design that simultaneously guarantees to carry out novel access network framework for NC technology and many grades QoS has become the emphasis of industry personnel's research.Main purpose of the present invention is the EPON draft standard based on up-to-date, and a kind of New type of S IEPON logical architecture that can effectively carry out NC operation and guarantee many grades traffic differentiation is simultaneously provided.This cellular logic framework has utilized the broadcast characteristic of power splitter further to reduce energy resource consumption, Multi-point Control Protocol in 1G/10G EPON standard IEEE 802.3ah/IEEE802.3av (MPCP, Multipoint Control Protocol) agreement has been carried out to respective extension.Be embodied in OLT and ONU uplink and downlink ESP aspect packet classification, queue configuration and scheduling of resource.
Summary of the invention
The design of the service-interworking Ethernet passive optical network logical architecture based on NC and QoS perception is subject to the driving of business characteristic in network, localized trend and the diversity feature of business have been considered simultaneously, and in the process of design, from promoting energy-saving efficiency and the network performance aspect of network, tightly round ESP new types of data routing infrastructure in SIEPON, utilize the multicast feature of power splitter, effectively promoted the energy efficiency that information transmits; The configuration of queue function module [Q], scheduling feature module [S] etc. by ESP in SIEPON, has effectively promoted the ability of network at aspects such as data transfer performance, the supports of many grade services quality.
The present invention adopts following technical scheme:
A service-interworking Ethernet passive optical network system based on NC and QoS perception, is characterized in that: this system is made up of an OLT and multiple ONU, and each ONU can support multiple terminal uses; The ESP of carrying Frame realizes transmitted in both directions; Adopt NC technology to realize the information interaction between OLT and ONU and each ONU.Wherein said ESP is the data routing structure of having introduced the following eight functions module of having of service characteristic, and described eight functions module comprises input functional module [I], sort module [C], debugging functions module [M], maintenance/shaping feature module [P/S], cross connect function module [X], queue function module [Q], scheduling feature module [S], output function module [O].
Further, described information interaction realizes by decoding and the scheduling at the coding in OLT and scheduling and ONU place.Coding in described OLT and scheduling comprise that OLT holds the NC carrying out to distribute, encoding operation and control and management.The decoding at described ONU place and scheduling comprise that ONU holds NC label detection, decode operation and the control and management carried out.
Further, OLT holds the NC carrying out to distribute, encoding operation and control and management realize respectively in debugging functions module [M], queue function module [Q] and scheduling feature module [S], wherein: debugging functions module [M] realizes the distribution of NC, be specially: in the time that Frame arrives and be mapped in ESP, the module [M] of ESP can be differentiated multicast group effectively by set code identification position in the REPORT of MPCP agreement control information, if this position is 1, illustrating that it is carrying needs coded data information; The data flow that queue function module [Q] arrives with the mode buffer memory of first-in first-out and the packet that needs are exchanged are encoded; Scheduling feature module [S] is controlled and management NC, be specially: after in queue function module [Q], encoding operation completes, the encoded packets existing in network is carried out to multicast transmission, the Mobile state allocated bandwidth of going forward side by side (DBA, dynamic bandwidth allocation) algorithm calculated data bag transmits shared time slot.The encoding operation that described queue function module [Q] is carried out is for adopting XOR mode.
Further, ONU holds the NC label detection of carrying out, decode operation and control and management are respectively at sort module [C], in queue function module [Q] and scheduling feature module [S], realize, wherein: sort module [C] carries out NC label detection, be specially: in the time introducing NC in SIEPON, in GATE control information, arrange the corresponding positions in reserved byte according to the numerical order of ONU in network, sort module [C] in ONU is differentiated received GATE frame, if the corresponding reserved place of corresponding certain ONU is 1, show that this object ONU receives the network code business of ONU since then, if be all 0 represent to receive for from the not network code business of OLT, the decode operation that queue function module [Q] is carried out is specially: on down direction, each ONU decodes according to decoding rule in its module [Q], obtains destination data, the control and management that scheduling feature module [S] is carried out is specially: on up direction, in specific time slot, receive the GATE information of OLT, and by analyzing GATE information transmission network encoded traffic and non-network code business.Decoding rule in the decode operation that described queue function module [Q] is carried out is for carrying out xor operation by encoded packets and the former upstream data bag being buffered in wherein.
System of the present invention also comprises, in OLT and ONU by all Frames according to the priority mapping of different business on ESP, wherein:
1) sort module in the ESP of OLT and ONU [C] will identify various business;
2) multiple subqueue functional modules [Q] are all set come the priority query of buffer memory different brackets at the ESP of OLT and ONU, adopt different DBA algorithms for different priority queries.
Accompanying drawing explanation
Fig. 1 is the data routing structure of SIEPON; And Fig. 2 is the schematic diagram of logical network framework of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
SIEPON is based upon on traditional EPON architecture basics, and one of its key character is to have introduced unified data routing structure in the MAC of OLT and ONU layer client, as shown in Figure 1.Each data routing structure comprises eight functional blocks, i.e. input functional module [I], sort module [C], debugging functions module [M], maintenance/shaping feature module [P/S], cross connect function module [X], queue function module [Q], scheduling feature module [S], output function module [O].There is the data routing structure of above-mentioned eight functions module, if introduce service characteristic, formed the concept of the ESP in SIEPON.
The present invention has designed a kind of service-interworking Ethernet passive optical network framework based on NC and QoS perception.As shown in Figure 2, be made up of an OLT and multiple ONU, each ONU can support multiple terminal uses.The ESP of carrying Frame realizes transmitted in both directions.Between OLT and ONU, information interactive process still adopts the MPCP agreement of EPON, adopts the Data Transmission Controlling mechanism of request-mandate (REPORT-GATE).
For meeting business localization trend in network, need to expand MPCP agreement, adopt NC technology to realize the information interaction between OLT and ONU and each ONU.Major embodiment is: decoding and the scheduling at the coding in OLT and scheduling and ONU place.
1.OLT holds the NC carrying out to distribute, and encoding operation and control and management philosophy are realized in debugging functions module [M], queue function module [Q] and scheduling feature module [S].
1) debugging functions module [M]
In module [M], mainly realize the distribution of NC.In the time that Frame arrives and be mapped in ESP, the module [M] of ESP can be differentiated multicast group effectively by set code identification position in the REPORT of MPCP agreement control information, if this position is 1, illustrating that it is carrying needs coded data information.Therefore, whether be the business that needs coding to the functional module in OLT [M] if can differentiate according to the code identification position in REPORT message.
2) queue function module [Q]
Module [Q] is mainly used in the data flow of buffer memory arrival and adopts XOR mode to encode the packet of needs exchange.The module [Q] of ESP is with the mode buffer memory business of first-in first-out, first join this queue Frame can first for sending.For encoded packets and non-coding bag, OLT can sort in the queue of corresponding coding and non-coding queue.
3) scheduling feature module [S]
The major function of module [S] is to control and management NC.After in [Q], encoding operation completes, encoded packets on down direction in network needs multicast transmission, in addition must calculated data wrap in up-downlink direction and transmit shared time slot, carry out Dynamic Bandwidth Allocation (DBA, dynamic bandwidth allocation) process.Therefore, in the inner mixed scheduling process that will carry out packet scheduling and timeslot scheduling of module [S].
2.ONU holds the NC label detection of carrying out, and decode operation and control and management philosophy are realized in sort module [C], queue function module [Q] and scheduling feature module [S].
1) sort module [C]
In MPCP agreement in standard IEEE 802.3ah/av, stipulate that LLID (LLID, Logical Link Identifier) can make certain definite ONU obtain the information from OLT.In the time introducing NC in SIEPON, in GATE control information, arrange the corresponding positions in reserved byte according to the numerical order of ONU in network, sort module [C] in ONU is differentiated received GATE frame, if the corresponding reserved place of corresponding certain ONU is 1, show that this object ONU receives the network code business of ONU since then, if be all 0 represent to receive for from the not network code business of OLT.
2) queue function module [Q]
It is inner that former upstream data need to be buffered in the queue function module [Q] of each ONU, on down direction, each ONU, according to encoded packets and the decoding rule that the packet of up transmission before carries out xor operation are decoded accordingly in its module [Q], obtains destination data.
3) scheduling feature module [S]
On up direction, ONU will receive the GATE information of OLT in specific time slot according to mixed scheduling process algorithm, and by analyzing GATE information transmission network encoded traffic and non-network code business.
3. in order to support the QoS of many grades, OLT from ONU for different priority services, all Frames all will be mapped on ESP.
1) sort module in the ESP of OLT and ONU [C] will identify various business.For the purpose of simple, in the present invention, business is divided into: expedited forwarding (EF, Expedited Forward), determine three kinds of different grades of forward type (AF, Assured Forward) and the type of doing one's best (BE, Do Best Forward).Wherein the business of EF grade is the CBR business of delay-sensitive, constant rate, as voice service; The business of AF grade is higher to postponing requirement, as audio service; The business of BE grade is less demanding to postponing comparatively speaking, as some data service.
2) multiple subqueue functional modules [Q] are all set come the priority query of buffer memory different brackets at the ESP of OLT and ONU, adopt different DBA algorithms for different priority queries.
On up direction, the traffic frame of the different brackets receiving from user side in ONU is all mapped to ESP's [Q], to the traffic frame of the EF grade arriving, in its queue function module [Q], be the mark of a high priority of its configuration, queue size does not rely on the REPORT of ONU end; To the traffic frame of the AF grade arriving, to its other mark of configuration medium priority, and sequence size is reported to OLT according to the MPCP agreement of standard; To the traffic frame of the BE grade arriving, to its other mark of configuration low priority, the same with AF, sequence size is reported to OLT according to the MPCP agreement of standard.
On down direction, the traffic frame of different brackets that in OLT, service network interface arrives is all mapped in the ESP of OLT in corresponding multiple subqueue functional modules [Q]; The scheduling feature module [S] of ESP is responsible for towards different business level setting DBA algorithm, for the business of EF grade, for it distributes a constant bandwidth; For the business of AF and BE grade, DBA is that it calculates corresponding transmission bandwidth by bandwidth on demand.
The present invention, by consider NC technology and QoS perception simultaneously, has designed service-interworking Ethernet passive optical network logical architecture, and it has the following advantages on network performance:
1. the present invention does not directly utilize multicast ESP, but by packet being carried out to the form of NC, utilizes the natural broadcast characteristic of power splitter that NC bag is carried out to the transmission of down direction, has so just greatly reduced the number of times that packet transmits, and has saved energy resource consumption.
2. the present invention takes full advantage of the specific implementation of SIEPON draft standard aspect guarantee QoS, by carry out the business packet of buffer memory different business grade with the different buffer queues of OLT node in design architecture and ONU node, packet stream is dispatched accordingly, realized the support to many grade services quality.The invention of this framework has good extensibility, can fully be adapted to different queue methods of service and different DBA mode etc.
Technical scheme of the present invention is based on 10G EPON, and has good extensibility.In the time that new variation occurs the business of future network, method of the present invention can be by implementing corresponding function and adapt to this new variation corresponding debugging functions module [M], sort module [C], queue function module [Q] and scheduling feature module [S] being inner; Guarantee with regard to QoS, can be by carrying out software upgrading in the inner design of carrying out any dispatching algorithm of scheduling feature module [S], and without change overall network framework.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the service-interworking Ethernet passive optical network system based on NC and QoS perception, is characterized in that: this system is made up of an OLT and multiple ONU, and each ONU can support multiple terminal uses; The ESP of carrying Frame realizes transmitted in both directions; Adopt NC technology to realize the information interaction between OLT and ONU and each ONU.
2. system according to claim 1, described ESP is the data routing structure of having introduced the following eight functions module of having of service characteristic, and described eight functions module comprises input functional module [I], sort module [C], debugging functions module [M], maintenance/shaping feature module [P/S], cross connect function module [X], queue function module [Q], scheduling feature module [S], output function module [O].
3. system according to claim 2, described information interaction realizes by decoding and the scheduling at the coding in OLT and scheduling and ONU place.
4. system according to claim 3, the coding in described OLT and scheduling comprise that OLT holds the NC carrying out to distribute, encoding operation and control and management.
5. system according to claim 4, described OLT holds the NC carrying out to distribute, and encoding operation and control and management realize respectively in debugging functions module [M], queue function module [Q] and scheduling feature module [S], wherein:
Debugging functions module [M] realizes the distribution of NC, be specially: in the time that Frame arrives and be mapped in ESP, the module [M] of ESP can be differentiated multicast group effectively by set code identification position in the REPORT of MPCP agreement control information, if this position is 1, illustrating that it is carrying needs coded data information;
The data flow that queue function module [Q] arrives with the mode buffer memory of first-in first-out and the packet that needs are exchanged are encoded;
Scheduling feature module [S] is controlled and management NC, be specially: after in queue function module [Q], encoding operation completes, the encoded packets existing in network is carried out to multicast transmission, the Mobile state allocated bandwidth of going forward side by side (DBA, dynamic bandwidth allocation) algorithm calculated data bag transmits shared time slot.
6. system according to claim 5, the encoding operation that described queue function module [Q] is carried out is for adopting XOR mode.
7. system according to claim 3, the decoding at described ONU place and scheduling comprise that ONU holds NC label detection, decode operation and the control and management carried out.
8. system according to claim 6, described ONU holds the NC label detection of carrying out, and decode operation and control and management realize respectively in sort module [C], queue function module [Q] and scheduling feature module [S], wherein:
Sort module [C] carries out NC label detection, be specially: in the time introducing NC in SIEPON, in GATE control information, arrange the corresponding positions in reserved byte according to the numerical order of ONU in network, sort module [C] in ONU is differentiated received GATE frame, if the corresponding reserved place of corresponding certain ONU is 1, show that this object ONU receives the network code business of ONU since then, if be all 0 represent to receive for from the not network code business of OLT;
The decode operation that queue function module [Q] is carried out is specially: on down direction, each ONU decodes according to decoding rule in its module [Q], obtains destination data;
The control and management that scheduling feature module [S] is carried out is specially: on up direction, in specific time slot, receive the GATE information of OLT, and by analyzing GATE information transmission network encoded traffic and non-network code business.
9. system according to claim 8, the decoding rule in the decode operation that described queue function module [Q] is carried out is for carrying out xor operation by encoded packets and the former upstream data bag being buffered in wherein.
10. according to the system described in aforementioned arbitrary claim, in OLT and ONU by all Frames according to the priority mapping of different business on ESP, wherein:
1) sort module in the ESP of OLT and ONU [C] will identify various business;
2) multiple subqueue functional modules [Q] are all set come the priority query of buffer memory different brackets at the ESP of OLT and ONU, adopt different DBA algorithms for different priority queries.
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| CN109818879A (en) * | 2017-11-22 | 2019-05-28 | 华为技术有限公司 | Flow control methods and device |
| CN109450604A (en) * | 2018-09-25 | 2019-03-08 | 国家电网有限公司客户服务中心 | A kind of strange land dual-active system business rank division method standby towards calamity |
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