CN102820943B - Wavelength management method between OLT (optical line terminal) and ONU (optical network unit) in TWDM-PON (time wavelength division multiplexing-passive optical network) - Google Patents
Wavelength management method between OLT (optical line terminal) and ONU (optical network unit) in TWDM-PON (time wavelength division multiplexing-passive optical network) Download PDFInfo
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- CN102820943B CN102820943B CN201210288776.9A CN201210288776A CN102820943B CN 102820943 B CN102820943 B CN 102820943B CN 201210288776 A CN201210288776 A CN 201210288776A CN 102820943 B CN102820943 B CN 102820943B
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Abstract
The invention discloses a wavelength management method between an OLT (optical line terminal) and an ONU (optical network unit) in a TWDM-PON (time wavelength division multiplexing-passive optical network), which relates to the field of the PON optical access. The method comprises the following steps of determining a domain master and an assistant domain master through an OLT WLA (wavelength arbitration) layer function, and utilizing a modified PON-ID (identity) field by the domain master and the assistant domain master to transmit identity information; transmitting a first message of a requested wavelength by the ONU on an uplink wavelength PLOAM (physical layer operations, administration and maintenance) channel corresponding to the domain master, allocating a wavelength pair by the domain master to the ONU and a corresponding host OLT, and transmitting a second message on a downlink PLOAM channel; acquiring the required wavelength information corresponding to the host OLT by the ONU, and transmitting a wavelength acquisition success instruction; otherwise searching the assistant domain master, and transmitting a wavelength acquisition failure instruction for the uplink wavelength of the assistant domain master; and generating a novel master domain through the OLT WLA layer after the assistant domain master receives an applicant wavelength failure massage. Due to the adoption of the wavelength management method, the used wavelength can be determined by the ONU in the receiving direction and in the transmitting direction, the wavelength can be rapidly and reliably managed, and the construction cost of the network can be saved.
Description
Technical field
The present invention relates to mixing PON (the Passive OpticalNetwork of multi-wavelength time-division wavelength division multiplexing, EPON) access field, particularly relate to a kind of TWDM-PON (TimeWavelength Division Multiplexing-Passive Optical Network, time-division WDM-PON) OLT (Optical Line Tterminal in system, optical line terminal) and ONU (Optical Network Unit, optical network unit) between wavelength management method.
Background technology
Optical Access Network, as the pith of in Networks of Fiber Communications, has broad application prospects.But, along with enriching of business tine, the bandwidth of demand is more and more higher, EPON (the Ethernet Passive Optical Network of 1G/2.5G speed, Ethernet passive optical network) or GPON (Gigabit-Capable Passive Optical Network, gigabit/gigabit passive optical network) and 10G/2.5G speed XG-PON can not meet the demand of future market bandwidth.In next-generation passive optical access network (NG PON2), based on the research of TWDM-PON technology by industry extensive concern.TWDM-PON adopts the PON of wavelength-division and multiplex technique, is called as time-division WDM-PON.
TWDM-PON is because keep ODN (Optical Distribution Network, optical distribution network) constant, and the splitter namely in ODN is only luminous-power distributor, instead of Wavelength routing or wavelength selector.The method quoting wavelength-division multiplex technique in system is comparatively simple, and wavelength selector just drops to ONU place, and the wavelength that concrete ONU uses then is determined by the protocol negotiation of local side and far-end.Therefore, the key of TWDM-PON is the design and implimentation of system wavelength management agreement, so as to realize ONU use the management of wavelength.
The system architecture of TWDM-PON is shown in Figure 1, and N number of OLTport controller (or being called for short OLT controller) of composition OLT, after closing wave separater, uses shared ODN and ONU to communicate, N=4 or 6 or 8 or 16.ONU has can the reception of wavelength tuning and transmission.
In the system of TWDM-PON multi-wavelength, how multiple OLT port controller realizes the activation of ONU and some other management activity, is a problem needing emphasis to consider.Wherein, being assigned the wavelength pair of up-downgoing alternately to ONU by the administrative messag of wavelength management passage, is a focus.Generally designate the wavelength pair that default OLT port controller uses, as wavelength as management channels, there is following shortcoming:
(1) during OLT port controller failure, whole system can not realize wavelength management, and when all ONU need when restarting to be switched to this wavelength, easily causes time delay.
(2) channel that a certain OLT port controller uses does not have selectivity as wavelength management passage, cannot evade OLT port controller as the whole system paralysis of breaking down caused when the master of territory.
(3) in order to meet all ONU in the urgent need to finding the needs of territory master, The faster the better for the main membership information in territory requiring territory master (OLT) to broadcast in its territory, but, this information is only at XGTC (XGPON transmission convergence at present, XGPON Transmission Convergence) PLOAM (Physical Layer Operations, the Administration andMaintenance of frame, physical layer operations administers and maintains) transmit in message, not soon.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of wavelength management method between OLT and ONU in TWDM-PON system is provided, make ONU can determine used wavelength in transmitting-receiving both direction, and utilize a field of XGPON system descending XGTC frame as territory owner identification informing mechanism, realize fast and reliable ground management of wavelengths, save the construction cost of network.
Wavelength management method in TWDM-PON system provided by the invention between OLT and ONU, comprise the following steps: A, in time advocating peace and lost efficacy for territory is main in the territory that N number of OLT port determines arbitrating wavelength, changed the secondary master of territory master by the WLA layer function of OLT, N is the number of OLT port in territory, N=4 or 6 or 8 or 16; The major and minor master in territory all uses the PON-ID field of the amendment of XG-PON descending XGTC frame to send the certificate information of carrying the major and minor owner identification of representative domain; B, ONU are after management of wavelengths channel receives the main certificate information in territory, the up wavelength PLOAM channel of the main correspondence in territory sends request ONU wavelength and the tuning capability report thereof of wavelength, territory master to giving ONU and corresponding main frame OLT, and sends wavelength specified command message at descending PLOAM channel at the WLA Layer assignment wavelength of OLT; C, in the mutual process of main frame OLT and ONU, if ONU obtains the wavelength information of required respective hosts OLT, then to send " obtaining wavelength successfully to indicate "; Break down when territory is main, ONU does not receive wavelength specified command message, then find secondary main, and send " obtaining wavelength unsuccessfully to indicate " at the upgoing wave long hair of secondary master; Receive after sending application wavelength failed message, through the WLA layer process of OLT, get back to steps A, produce new territory master.
In technique scheme, in described XGPON system, descending XGTC frame structure comprises physics synchronization blocks and XGTC frame, wherein, XGTC frame structure is G.987.3 standard, be made up of fixed size 135432 byte, comprise the payload portions of XGTC frame head and XGTC, XGTC load forms the service adapter process sublayer of transmitting terminal and receiving terminal.
In technique scheme, described descending XGTC frame head comprises the descending frame head Length Indication structure of a fixed size and the subregion of Two Variables size: Bandwidth map and descending PLOAM subregion, this descending PLOAM subregion transmits descending OAM message, the size of downlink physical synchronization blocks is wherein 24 bytes, and it comprises the structure of three independently 8 bytes: physical layer synchronization sequence, super-frame number structure and PON-ID structure.
In technique scheme, containing to specify and advocate peace the instructions field of secondary main certificate information in territory in the PON-ID structure of described XGPON-PON descending XGTC frame, described instructions field employing y bit shows to advocate peace secondary main information in territory, 1≤y≤51, and y is positive integer.
In technique scheme, the wavelength of ONU described in step B and tuning capability report thereof comprise type of message mark, sequential coding, ONU sends wavelength, ONU receives wavelength, ONU sends wavelength tunability, ONU receives wavelength tunability codomain; Described wavelength specified command message comprises type of message mark, sequential coding, ONU sends wavelength and ONU receives wavelength codomain.
In technique scheme, obtain wavelength in step C and successfully indicate the wavelength acquisition bit all adopting up XGTC head with failed wavelength instruction, wavelength obtains the indication field that bit is XGTC head, a bit shared after amendment; Wavelength obtains bit=1 and successfully indicates for obtaining wavelength; Wavelength obtains bit=0 and unsuccessfully indicates for obtaining wavelength.
Compared with prior art, advantage of the present invention is as follows:
(1) the present invention can meet the requirement of TWDM PON, and the wavelength that TWDM PON and conventional P ON shared ODN, an ONU are used is solved after being consulted by OLT and ONU, and the existing ODN investment of protection operator, saves the construction cost of network.
(2) the present invention can realize quick management of wavelengths, reduces the time that ONU consults wavelength.
(3) the present invention can realize the automatic protection of territory master and the support scheme of switching, for the selection of wavelength management passage, and the mechanism ratio of territory master fixing or specify single wavelength high as the reliability of the method for management channels in advance.
Accompanying drawing explanation
Fig. 1 is the system architecture diagram of TWDM-PON.
Fig. 2 is the structured flowchart of OLT in TWDM-PON system.
Fig. 3 is the structural representation of descending XGTC frame in XGPON system.
Fig. 4 is the schematic diagram successfully indicating and obtain wavelength unsuccessfully to indicate at the up acquisition wavelength of XGTC head.
Fig. 5 is the flow chart that in the embodiment of the present invention, ONU obtains wavelength.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
In TWDM-PON system, the structure of OLT is shown in Figure 2, and one group of wavelength of TWDM-PON is a territory, and the wavelength of this group forms the up-downgoing wavelength of multiple OLT controller respectively.When system is in normal operating conditions, multiple ONU is registered on different OLT controllers respectively, and uses the wavelength of this OLT controller respectively.The OLT controller that ONU registers is called main frame OLT.When ONU starts, in order to find main frame OLT, need the wavelength from the OLT controller corresponding to the main there acquisition in territory activation and use, territory is main is a special OLT controller, this OLT controller is through OLT WLA (WavelengthArbitration, wavelength is arbitrated) the layer acquisition main qualification in territory, and the qualification of its territory master is issued at descending in-band management passage.Secondary master is also a special OLT controller, and this OLT controller obtains secondary main qualification through OLT WLA layer, and issues its secondary main qualification at descending in-band management passage.
Wavelength management method in the TWDM-PON system of the embodiment of the present invention between OLT and ONU, comprises the following steps:
S1, determine from N number of OLT port DM (the Domain Master arbitrating wavelength by the WLA layer function of OLT, territory master) and changed ADM (the Assistant Domain Master of territory master when losing efficacy for territory is main, secondary main), N is the number of OLT port in territory, usual N=4 or 6 or 8 or 16.The main power had wavelength arbitration in territory, in secondary main monitoring territory, ONU registers ruuning situation, initiate during main inefficacy in territory to re-elect or submit to DC (DomainController, domain controller) ruling, producing new territory advocates peace secondary main, be specially and receive ONU registration failure information, submit to WLA to initiate to re-elect.Determine that the method for territory master can be but be not limited to be OLT port " election ", also can by the domain controller ruling of WLA inside.
S2, the major and minor master in territory all use several bits of the PON-ID field structure of XG-PON descending XGTC frame, namely use the field of the PON ID of amendment to send the certificate information of carrying the major and minor owner identification of representative domain.
Shown in Figure 3, in XGPON system, descending XGTC frame structure comprises PSBd (Physical Synchronization Block of downstream, Physical Synchronization block) and XGTC frame.Wherein, XGTC frame structure is G.987.3 standard, is made up of, comprises the payload portions of XGTC frame head and XGTC fixed size 135432 byte, and XGTC load forms the service adapter process sublayer of transmitting terminal and receiving terminal.Descending XGTC frame head comprises HLend (the Header Length indication of downstream of a fixing size, descending frame head Length Indication) subregion of structure and Two Variables size: BWMAP (BandwidthMap, Bandwidth map) and PLOAMd (Physical Layer OAM of downstream, descending PLOAM subregion), this descending PLOAM subregion transmits descending OAM message, the size of downlink physical synchronization blocks is wherein 24 bytes, it comprises the structure of three independently 8 bytes: PSync (Physical Synchronization sequence, physical layer synchronization sequence), super-frame number structure, PON-ID structure.
Containing to specify and advocate peace the instructions field of secondary main certificate information (Credential) in territory in XGPON-PON descending XGTC frame structure, advocating peace secondary main information in territory to use y bit to show in instructions field, 1≤y≤51, and y is positive integer.Because PON-ID field contains HEC (HybridError Correction, mixing error code correction), y=2 (2 bits) just can show to advocate peace secondary owner identification in territory.When Credential=1 is shown to be territory master.When Credential=2 is shown to be secondary main.Credential=03 is reserved word; Credential=0, shows that the non-pair of non-territory master is main.
S3, ONU is after management of wavelengths channel receives the main certificate information in territory, the up wavelength PLOAM channel of the main correspondence in territory sends request the first message of wavelength: ONUwavelength and tunability report (ONU wavelength and tuning capability report thereof), the form ginseng of the first message is shown in Table 1, this first message comprises Message type ID (type of message mark), Sequence number (sequential coding), ONU Tx wavelength (ONU sends wavelength), ONU Rx wavelength (ONU receives wavelength), ONU Tx tunability (ONU sends wavelength tuning ability), the codomains such as ONU Rx tunability (ONU receives wavelength tuning ability).
The form of table 1, the first message
| Octet | Content |
| 1-2 | Unassigned ONU-ID or assigned ONU-ID |
| 3 | Message type ID |
| 4 | Sequence number |
| 5～w | ONU Tx wavelength |
| (w+1)～x | ONU Rx wavelength |
| (x+1)～y | ONU Tx tunability |
| (y+1)～z | ONU Rx tunability |
| (z+1)～40 | Reserved or padding |
| 41-48 | Message integrity check |
S4, territory master at the Layer assignment wavelength of OLT WLA to giving ONU's and corresponding main frame OLT, and send the second message at descending PLOAM channel: Wavelength assignmentcommand (wavelength specified command) message, the form ginseng of the second message is shown in Table 2, and the second message comprises the codomain such as Message type ID (type of message mark), Sequence number (sequential coding), ONU Tx wavelength (ONU sends wavelength), ONU Rx wavelength (ONU receives wavelength).
The form of table 2, the second message.
| Octet | Content |
| 1-2 | Assigned ONU-ID |
| 3 | Message type ID |
| 4 | Sequence number |
| 5～a | ONU Tx wavelength |
| (a+1)～b | ONU Rx wavelength |
| (b+1)～40 | Reserved or padding |
| 41-48 | Message integrity check |
PLOAM message in the band of step S3 and S4 use XGPON, the management information of wavelength in the activation of ONU, or revise existing PLOAMs, or the mode defining new PLOAMs is carried out.
S5, main frame OLT process the registration of ONU in its activation.Main frame OLT with ONU reciprocal process, ONU obtains the wavelength information of required respective hosts OLT, then send " obtain wavelength successfully indicate ".
S6, break down when territory is main, ONU does not receive Wavelength assignmentcommand message, then find secondary main, and send " obtaining wavelength unsuccessfully to indicate " at the upgoing wave long hair of secondary master.
Shown in Figure 4, obtain wavelength and successfully indicate Wavelength acquire (wavelength acquisition) bit all adopting up XGTC head with failed wavelength instruction, Wavelength acquire bit is IND (instruction) field of XGTC head, a bit shared after amendment.Wavelength acquire=1 successfully indicates for obtaining wavelength; Wavelength acquire=0 unsuccessfully indicates for obtaining wavelength.
S7, receive and send application wavelength failed message after, through the WLA layer process of OLT, get back to step S1, to produce new territory master.
Shown in Figure 5, in the embodiment of the present invention, the flow process of ONU acquisition wavelength is as follows:
After OLT powers on, by the WLA layer function of OLT from N number of OLT port, determine that No. 1 OLT controller is territory master, No. 2 OLT controllers are secondary main, and then, the territory descending XGTC frame of secondary instigator XG-PON of advocating peace sends its identity information.
ONU
kafter powering on, its receive direction searches downstream wavelength, searches the information of whether territory master, if do not find, then searches next downstream wavelength passage.After finding territory master, the up wavelength of its correspondence sends request the first message of wavelength.
Territory is main receive the first message sending request wavelength after, send PLOAM second message: Wavelength assignment PLOAM message.
ONU
kafter receiving wavelength second message, obtain the wavelength of required respective hosts OLT, then send " obtain wavelength successfully indicate ", and start be tuned to main frame OLT wavelength on, register normally (REG).
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention comprises these change and modification.The content be not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. the wavelength management method in TWDM-PON system between OLT and ONU, is characterized in that, comprise the following steps:
A, in time advocating peace and lost efficacy for territory is main in the territory that N number of OLT port determines arbitrating wavelength, changed the secondary master of territory master by the WLA layer function of OLT, N is the number of OLT port in territory, N=4 or 6 or 8 or 16; The major and minor master in territory all uses the PON-ID field of the amendment of XG-PON descending XGTC frame to send the certificate information of carrying the major and minor owner identification of representative domain;
B, ONU are after management of wavelengths channel receives the main certificate information in territory, the up wavelength PLOAM channel of the main correspondence in territory sends request ONU wavelength and the tuning capability report thereof of wavelength, territory master to giving ONU and corresponding main frame OLT, and sends wavelength specified command message at descending PLOAM channel at the WLA Layer assignment wavelength of OLT;
C, in the mutual process of main frame OLT and ONU, if ONU obtains the wavelength information of required respective hosts OLT, then to send " obtaining wavelength successfully to indicate "; Break down when territory is main, ONU does not receive wavelength specified command message, then find secondary main, and send " obtaining wavelength unsuccessfully to indicate " at the upgoing wave long hair of secondary master; Receive after sending application wavelength failed message, through the WLA layer process of OLT, get back to steps A, produce new territory master.
2. the wavelength management method in TWDM-PON system as claimed in claim 1 between OLT and ONU, it is characterized in that: in described XG-PON system, descending XGTC frame structure comprises physics synchronization blocks and XGTC frame, wherein, XGTC frame structure is G.987.3 standard, be made up of fixed size 135432 byte, comprise the payload portions of XGTC frame head and XGTC, XGTC load forms the service adapter process sublayer of transmitting terminal and receiving terminal.
3. the wavelength management method in TWDM-PON system as claimed in claim 2 between OLT and ONU, it is characterized in that: described descending XGTC frame head comprises the descending frame head Length Indication structure of a fixed size and the subregion of Two Variables size: Bandwidth map and descending PLOAM subregion, this descending PLOAM subregion transmits descending OAM message, the size of downlink physical synchronization blocks is wherein 24 bytes, and it comprises the structure of three independently 8 bytes: physical layer synchronization sequence, super-frame number structure and PON-ID structure.
4. the wavelength management method in TWDM-PON system as claimed in claim 3 between OLT and ONU, it is characterized in that: the instructions field of secondary main certificate information of advocating peace containing specified domain in the PON-ID structure of described XG-PON descending XGTC frame, described instructions field adopts y bit to show advocates peace secondary main information in territory, 1≤y≤51, and y is positive integer.
5. the wavelength management method in TWDM-PON system as claimed in claim 1 between OLT and ONU, is characterized in that: the wavelength of ONU described in step B and tuning capability report thereof comprise type of message mark, sequential coding, ONU sends wavelength, ONU receives wavelength, ONU sends wavelength tunability, ONU receives wavelength tunability codomain; Described wavelength specified command message comprises type of message mark, sequential coding, ONU sends wavelength and ONU receives wavelength codomain.
6. the wavelength management method in the TWDM-PON system according to any one of claim 1 to 5 between OLT and ONU, it is characterized in that: obtain wavelength in step C and successfully indicate the wavelength acquisition bit all adopting up XGTC head with failed wavelength instruction, wavelength obtains the indication field that bit is XGTC head, a bit shared after amendment; Wavelength obtains bit=1 and successfully indicates for obtaining wavelength; Wavelength obtains bit=0 and unsuccessfully indicates for obtaining wavelength.
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| CN103118309B (en) * | 2013-03-05 | 2015-07-29 | 烽火通信科技股份有限公司 | The method that time-division wavelength-division mixing PON system medium wavelength management channels is selected and switched |
| CN103248431B (en) * | 2013-04-26 | 2016-04-13 | 上海交通大学 | The transportable TWDM-PON system of a kind of ONU |
| CN103297874A (en) * | 2013-06-20 | 2013-09-11 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103401632A (en) * | 2013-07-16 | 2013-11-20 | 北京邮电大学 | Large request first-fair excess allocation dynamic wave length bandwidth allocation method |
| CN104811238B (en) * | 2014-01-28 | 2019-05-07 | 中兴通讯股份有限公司 | The timely partial wave division multiplexing system of passageway switching method, device, optical network unit |
| CN104010234A (en) * | 2014-05-19 | 2014-08-27 | 上海交通大学 | Transceiver sharing system and method among time division wavelength division multiplexing passive optical networks |
| KR102035629B1 (en) * | 2014-12-30 | 2019-10-23 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Communication methods, devices, and systems applied to multi-wavelength passive optical networks |
| JP6353605B2 (en) * | 2015-04-22 | 2018-07-04 | 日本電信電話株式会社 | Station side apparatus and wavelength switching method |
| US10305788B2 (en) * | 2016-06-30 | 2019-05-28 | Alcatel Lucent | Near-real-time and real-time communications |
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